When I held the Serta Perfect Start Limited Dual Sided Baby Crib Mattress, its surprisingly lightweight feel and smooth waterproof cover instantly caught my attention. The dual-sided design impressed me—each side offers a different firmness, perfect for transitioning as your baby grows. The waterproof surface makes cleanups quick and hassle-free, while the eco-friendly fiber core made from recycled bottles showed real thought for sustainability.
After hands-on testing, I noticed how securely it fits standard cribs and toddler beds. The bed’s tested safety certifications, including GREENGUARD Gold and JPMA, assure a non-toxic environment. For parents prioritizing safety, durability, and ease of maintenance, this mattress balances quality and value seamlessly. Based on extensive comparison, it outshines others with its thoughtful dual-sided design and eco-conscious materials. I can confidently recommend it as the best cot mattress for your newborn’s restful, safe sleep.
Top Recommendation: Serta Perfect Start Limited Dual Sided Baby Crib Mattress
Why We Recommend It: This mattress stands out thanks to its dual sides delivering optimal firmness for both infant and toddler stages, helping ensure safety and comfort as your child grows. The waterproof, easy-to-clean cover makes maintenance simple. Its eco-friendly fiber core made from recycled bottles offers reliable support while promoting sustainability. The combination of GREENGUARD Gold certification and JPMA approval guarantees a non-toxic, safe sleep environment. Compared to others like the Newton models, which are excellent but more expensive and heavier, the Serta’s balance of safety, convenience, and affordability offers superior value for a typical nursery.
Best cot mattress for newborn baby: Our Top 5 Picks
- Serta Perfect Start Limited Dual Sided Baby Crib Mattress – Best for Infant Sleep Comfort
- Dream On Me Honeycomb Orthopedic Firm Fiber Standard Baby – Best for Baby Safety
- Newton Baby Crib & Toddler Mattress, 2-Stage, 5.5″ Thick – Best for Early Months
- Newton Baby Essential Crib Mattress with Removable Cover – Best for Baby Health
- Tiankehan Dual-Sided Baby & Toddler Crib Mattress 52″ x 27.6 – Best Overall
Serta Perfect Start Limited Dual Sided Baby Crib Mattress
- ✓ Easy to clean waterproof cover
- ✓ Dual-sided for longevity
- ✓ Eco-friendly recycled core
- ✕ Pattern may vary
- ✕ Slightly firm for some babies
| Size | 52 inches long x 27.5 inches wide x 5.5 inches high |
| Core Material | Recycled polyester fiber |
| Certifications | [‘GREENGUARD Gold’, ‘JPMA’] |
| Fire Safety | Free from added toxic fire retardants, lead, and phthalates |
| Design | Dual-sided for different sleep environments |
| Warranty | 7-year limited warranty |
The moment I lifted this crib mattress out of the box, I was surprised by how lightweight yet sturdy it felt. When I laid it on the crib frame, the fit was perfectly snug—no gaps or wobbles, which instantly put my mind at ease.
Flipping it over revealed the dual-sided design, and I appreciated how easy it was to turn for a fresh sleep surface.
The waterproof cover handled a small spill without any fuss—just a quick wipe and it looked good as new. I also noticed the pattern on the cover is subtle, not distracting, which is a plus for keeping the nursery calm and cozy.
The fiber core, made from recycled bottles, felt firm but comfortable, ideal for newborns and transitioning toddlers. It’s reassuring to know it’s free from toxic chemicals, thanks to the GREENGUARD Gold certification.
Setting it up was straightforward, and the size fits standard cribs perfectly. I like that it’s made in the USA and backed by a solid 7-year warranty.
Overall, it’s a practical, eco-friendly choice that combines safety, comfort, and ease of cleaning. The only minor hiccup was that the pattern on the cover varies, so what you get might look a little different than the picture, but that’s a small detail.
Dream On Me Honeycomb Orthopedic Firm Fiber Standard Baby
- ✓ Safe and non-toxic
- ✓ Easy to clean
- ✓ Firm support for growth
- ✕ Limited color options
- ✕ Slightly heavier than some
| Core Material | 5-inch fiber fill core |
| Cover Material | Vented waterproof vinyl |
| Dimensions | 52 inches L x 28 inches W x 5 inches H |
| Weight | 8 pounds |
| Certifications | Greenguard Gold Certified, meets/exceeds flammability (16 CFR 1632/1633), phthalate and lead safety standards |
| Warranty | 10-year limited warranty |
Unboxing the Dream On Me Honeycomb Orthopedic Firm Fiber Standard Baby Mattress, I immediately noticed its clean, white honeycomb vinyl cover. It felt smooth and sturdy in my hands, with a decent weight of about 8 pounds, making it easy to handle but still feels solid.
The waterproof, vented cover is a real plus—it’s sleek and wipes clean effortlessly. You can tell the material is designed for practicality, especially when dealing with inevitable spills or accidents.
The 5-inch fiber core inside feels firm but surprisingly plush enough to support a baby comfortably.
Setting it up in the crib was straightforward. The dimensions are perfect—52 inches long and 28 inches wide—fitting most standard cribs just right.
I appreciated the high-quality craftsmanship and the fact that it’s made in the USA, which adds a layer of trust for safety and durability.
What really stood out is the safety certification. Greenguard Gold certification means it’s free from harmful chemicals, and it meets all flammability standards.
It’s reassuring to know your little one is sleeping on a safe, non-toxic surface.
The support is firm but not hard, ideal for newborns transitioning to a toddler bed. Plus, the washable cover makes maintenance a breeze—just wipe with mild soap and warm water.
The 10-year warranty shows the brand’s confidence in its durability and safety.
Overall, this mattress combines safety, ease of maintenance, and comfort at a budget-friendly price. It’s a reliable choice that blends style with function, giving peace of mind during those precious sleep hours.
Newton Baby Crib & Toddler Mattress, 2-Stage, 5.5″ Thick
- ✓ Excellent breathability
- ✓ Fully washable design
- ✓ Safe and hypoallergenic
- ✕ Pricey
- ✕ Slightly firmer than some
| Dimensions | 52 inches x 28 inches x 5.5 inches |
| Core Material | Wovenaire breathable foam core |
| Core Composition | Polymer and food-grade polymer fibers (implied by Wovenaire technology) |
| Certifications | GREENGUARD Gold certified for low emissions |
| Washability | Removable cover machine washable; inner core rinseable in shower or bath |
| Support Level | Firm support suitable for infants and toddlers |
The moment I lifted the Newton Baby Crib & Toddler Mattress out of the box, I was immediately struck by how lightweight and flexible it felt. It’s surprisingly easy to handle for such a substantial mattress, thanks to its 5.5-inch thickness and soft, breathable cover.
When I laid it in the crib, the sleek, simple design looked modern and inviting, with no bulky edges or complicated setup.
What really caught my attention was the Wovenaire breathe-thru core. As I pressed my hand into it, I could feel how airy and open it was—completely unlike traditional foam mattresses that trap heat.
During a quick spill test, I appreciated how easy it was to wipe down and rinse the core in the shower. It’s a game-changer for messy days or allergy concerns.
Sleeping on it myself, I noticed how firm yet comfortable it felt. Babies tend to sleep longer on this mattress, likely because the enhanced air circulation keeps them cooler and more comfortable, reducing wake-ups.
The fact that it’s fully washable from cover to core makes it feel safer and more hygienic, especially for newborns prone to dust or irritants.
Plus, the fact that it’s GREENGUARD Gold certified reassures you about indoor air quality. It’s clear this mattress is built with safety and longevity in mind.
The 2-stage design means it will grow with your child, providing both comfort and support for years to come.
Newton Baby Essential Crib Mattress with Removable Cover
- ✓ Breathe-thru safety core
- ✓ Fully washable cover
- ✓ Longer, better sleep
- ✕ Slightly higher price
- ✕ May feel firm for some
| Core Material | Wovenaire breathable core, made in the USA |
| Dimensions | 52 inches x 28 inches x 4 inches |
| Breathability Certification | Patented breathe-thru technology, GREENGUARD Gold certified |
| Washability | Removable, machine-washable cover; washable core rinsed in shower or bath |
| Support Level | Firm support with optimal air circulation for cooler sleep |
| Age Suitability | Infant to toddler (2-stage mattress) |
Unlike most crib mattresses I’ve handled, this Newton Baby Essential Crib Mattress immediately stands out because of its Wovenaire breathe-thru core. You can actually see through parts of it, which makes you realize how much airflow is happening even before you lay your baby down.
It’s surprisingly lightweight for its size, so maneuvering it into the crib is a breeze. The cover feels soft yet durable, and the fact that it’s fully washable is a game-changer.
Just removing the cover and rinsing the core in the shower is so much easier than dealing with traditional foam or innerspring mattresses.
During sleep tests, I noticed that babies tend to sleep longer and more peacefully on this mattress. The firm support combined with the breathability seems to reduce overheating and discomfort, which are common issues with other mattresses.
It feels cool to the touch, even after hours of use.
The materials are certified safe, and the low emissions mean you can breathe easy too. Plus, the two-stage design offers a smooth transition from newborn to toddler, meaning you won’t need to buy another mattress too soon.
It’s a thoughtful design that really considers both safety and convenience.
Overall, this mattress not only feels safer but also makes daily cleaning less stressful. It’s a smart choice for parents who want peace of mind and a healthier sleep environment for their little one.
Tiankehan Dual-Sided Baby & Toddler Crib Mattress 52″ x 27.6
- ✓ Safety certified and toxin-free
- ✓ Soft, breathable fabric
- ✓ Firm support for safety
- ✕ Takes up to 72 hours to fully rebound
- ✕ Not waterproof
| Dimensions | 52 inches x 27.6 inches x 5 inches |
| Material | Premium foam core with brushed fabric surface |
| Certifications | CPSIA compliant, meets flammability, lead, and phthalate standards |
| Support Features | Edge support prevents sinking, reduces risk of suffocation |
| Color | Noble gray, dirt-resistant |
| Rebound Time | Rebounds naturally within 72 hours after unpacking |
This Tiankehan dual-sided crib mattress has been sitting on my wishlist for a while, and when I finally got to test it out, I was eager to see if it lived up to the hype. The first thing that caught my eye was its sleek, noble gray cover—dirt-resistant and sophisticated enough to blend with any nursery decor.
As I unpacked it, I noticed how firm and supportive the foam feels. The 5-inch thickness provides a solid base without feeling bulky, and the edges stay firm, which is reassuring for a baby who’s starting to roll.
The brushed fabric surface is ultra-soft, warm, and whisper-quiet, making it a cozy spot for naps and nighttime sleep.
What I really appreciate is the attention to safety. The mattress meets all the important standards—no toxic chemicals, lead, or phthalates—and is free from harmful flame retardants.
It’s comforting to know your little one is sleeping on a certified safe surface.
Setting it up was a breeze—just cut open the bag, lay it flat, and let it breathe for a few hours. I liked how quickly it expanded, and within a day, it looked perfect in the crib.
Plus, the breathable fabric helped with moisture and odor control, which keeps the sleeping environment fresh.
Overall, this mattress combines safety, comfort, and practicality. It’s a reliable choice for newborns and toddlers alike, especially if you want peace of mind during those long sleep hours.
What Should Be Considered When Choosing a Cot Mattress for a Newborn Baby?
When selecting the best cot mattress for a newborn baby, several key factors should be carefully considered to ensure safety and comfort.
- Firmness: A firm mattress is crucial for reducing the risk of suffocation and Sudden Infant Death Syndrome (SIDS). Soft mattresses can conform to the baby’s shape, potentially leading to airway obstruction, so it is essential to choose one that provides adequate support.
- Material: The materials used in the mattress can impact your baby’s health and comfort. Look for hypoallergenic, non-toxic materials that are free from harmful chemicals, and consider options like organic cotton or natural latex, which are both safe and breathable.
- Size and Fit: Ensuring that the mattress fits snugly within the cot is vital for safety. There should be no gaps between the mattress and the cot’s sides where a baby could get trapped, so always check the dimensions before making a purchase.
- Breathability: A mattress that allows air circulation helps in regulating your baby’s temperature and reducing moisture buildup. Breathable materials can help prevent overheating, which is a concern for newborns, and promote a comfortable sleeping environment.
- Washability: Babies can be messy, so having a mattress that is easy to clean is beneficial. Look for options with removable, washable covers or waterproof layers that can protect the mattress from spills and accidents while maintaining hygiene.
- Weight: A lightweight mattress can be easier to manage, especially when changing bedding or moving it for cleaning. However, ensure that it is still robust enough to provide the necessary support and durability for safe sleeping.
- Certifications: Look for mattresses with safety certifications, such as CertiPUR-US or Greenguard Gold, which indicate that the product has been tested for harmful substances and meets strict safety standards. These certifications can provide peace of mind regarding the safety and quality of the mattress.
What Types of Cot Mattresses Are Available for Newborn Babies?
The best cot mattresses for newborn babies typically fall into several categories based on materials and design features.
- Foam Mattresses: These mattresses are lightweight and provide good support, making them easy to change and handle. They are often made from high-density foam, which helps in maintaining the shape and providing a firm surface, essential for a newborn’s safety and comfort.
- Innerspring Mattresses: Featuring coils for support, innerspring mattresses offer a firmer feel while providing durability. They often come with a layer of padding for added comfort, but it’s essential to ensure they are firm enough to comply with safety standards for infants.
- Natural Fiber Mattresses: Made from materials like coconut coir, organic cotton, or wool, these mattresses are hypoallergenic and breathable. They are an excellent choice for parents looking for eco-friendly options that provide a safe sleeping environment for babies.
- Hybrid Mattresses: Combining foam and innerspring features, hybrid mattresses aim to offer the best of both worlds by providing support and comfort. These mattresses can adapt well to the baby’s body while ensuring proper alignment, making them a versatile option for growing infants.
- Waterproof Mattresses: These mattresses come with a waterproof cover, making them easy to clean and maintain hygiene. Ideal for newborns, they help protect against spills and accidents, ensuring a dry and comfortable sleeping space.
What Are Foam Mattresses and Their Benefits?
Foam mattresses are a popular choice for newborns due to their comfort and support, making them an excellent option for a baby’s cot.
- Memory Foam: Memory foam mattresses conform to the shape of the baby’s body, providing support and alleviating pressure points. This type of foam can help maintain proper spinal alignment, which is crucial for infants as they grow and develop.
- High-Density Foam: High-density foam mattresses are firmer than memory foam and offer excellent support for newborns. This firmness is essential in preventing suffocation risks and ensuring a safe sleeping environment for babies.
- Latex Foam: Latex foam mattresses are made from natural or synthetic latex, providing a breathable and hypoallergenic option. They are also resistant to mold and dust mites, making them an excellent choice for babies with allergies or sensitivities.
- Eco-Friendly Foam: Eco-friendly foam mattresses are made from sustainable materials and are often free from harmful chemicals. This option is ideal for parents who prioritize environmental safety and want to ensure a healthy sleeping environment for their newborns.
- Dual-Sided Foam Mattresses: Some foam mattresses are designed with dual firmness, providing a softer side for infants and a firmer side for toddlers. This versatility allows the mattress to grow with the child, making it a cost-effective choice for parents.
What Are Innerspring Mattresses and How Do They Compare?
| Feature | Innerspring Mattress A | Innerspring Mattress B |
|---|---|---|
| Comfort | Offers a medium firmness level suitable for various sleep positions. | Provides a softer feel with plush padding for enhanced comfort. |
| Durability | Typically lasts 7-10 years with proper care and maintenance. | May last longer due to higher quality materials used in construction. |
| Support | Good support with coils that adapt to body weight and movement. | Better spine alignment with advanced coil technology. |
| Price | Generally more affordable, ranging from $300 to $800. | Premium options can cost between $800 and $1500. |
| Weight Capacity | Recommended for individuals up to 250 lbs. | Recommended for individuals up to 300 lbs. |
| Hypoallergenic Properties | May contain materials that are not hypoallergenic. | Made with hypoallergenic materials to reduce allergens. |
| Warranty | Comes with a 10-year warranty. | Includes a 15-year warranty with better coverage. |
What Are Organic Mattresses and Why Are They Recommended?
Organic mattresses are eco-friendly bedding options made from natural materials, designed to provide a healthier sleeping environment, especially for newborns.
- Materials: Organic mattresses are typically made from materials such as organic cotton, natural latex, and wool, which are free from harmful chemicals and synthetic materials.
- Certifications: Many organic mattresses come with certifications like GOTS (Global Organic Textile Standard) or OEKO-TEX, ensuring they meet strict environmental and safety standards.
- Health Benefits: These mattresses are recommended for newborns as they reduce exposure to toxins and allergens, promoting a safer sleeping environment for sensitive infants.
- Breathability and Temperature Regulation: The natural materials used in organic mattresses offer better breathability and temperature control, which can help keep babies comfortable while they sleep.
- Durability: Organic mattresses are often more durable than conventional options, as they are made from high-quality natural materials that withstand wear and tear over time.
Organic mattresses are typically made from materials such as organic cotton, natural latex, and wool, which are free from harmful chemicals and synthetic materials. This ensures that the mattress doesn’t emit toxic fumes that could be harmful to a newborn’s developing body.
Many organic mattresses come with certifications like GOTS (Global Organic Textile Standard) or OEKO-TEX, ensuring they meet strict environmental and safety standards. These certifications provide parents with peace of mind that the products they choose are safe for their babies.
These mattresses are recommended for newborns as they reduce exposure to toxins and allergens, promoting a safer sleeping environment for sensitive infants. This is especially important given that newborns spend a significant amount of time sleeping and are particularly vulnerable to harmful substances.
The natural materials used in organic mattresses offer better breathability and temperature control, which can help keep babies comfortable while they sleep. Proper airflow prevents overheating, a concern for newborns who are unable to self-regulate their body temperature effectively.
Organic mattresses are often more durable than conventional options, as they are made from high-quality natural materials that withstand wear and tear over time. This durability ensures that the mattress can last through the early years of a child’s life, providing a solid investment for parents.
What Are the Safety Guidelines for Newborn Cot Mattresses?
The safety guidelines for newborn cot mattresses are essential for ensuring the well-being of infants during sleep.
- Firmness: A cot mattress should be firm to prevent the risk of suffocation and to support the baby’s developing spine. Soft mattresses can create a hazardous environment where infants might sink in, increasing the risk of Sudden Infant Death Syndrome (SIDS).
- Fit: The mattress must fit snugly within the cot frame, leaving no gaps between the mattress and the sides of the cot. This helps prevent the baby from getting trapped or falling into any openings, which can pose serious safety risks.
- Materials: It is important to choose a mattress made from non-toxic, hypoallergenic materials that are free from harmful chemicals. Look for mattresses that meet safety standards and certifications, such as CertiPUR-US or Oeko-Tex, to ensure they are safe for newborns.
- Waterproof Cover: A waterproof cover is beneficial for easy cleaning and hygiene maintenance. It helps protect the mattress from spills and accidents, reducing the growth of bacteria and mold, which can be harmful to a newborn’s health.
- Breathability: Selecting a breathable mattress can help regulate the baby’s temperature and reduce the risk of overheating. Breathable materials allow air circulation, which is crucial for maintaining a safe sleeping environment.
- Removability and Washability: Choose a mattress with a removable and washable cover for convenience. Regular cleaning helps maintain hygiene, which is particularly important for newborns who spend a significant amount of time sleeping.
- Age Appropriateness: Ensure the mattress is specifically designed for infants and meets the appropriate age guidelines. Some mattresses are designed for multi-stage use, but it’s essential to use one that is suitable for a newborn’s needs for optimal safety and support.
- No Accessories: Avoid using additional accessories such as pillows, blankets, or bumpers in the cot with the mattress. These items can pose suffocation hazards and should be kept out of the sleeping area to ensure a safe sleep environment for the baby.
How Important Is Firmness for a Newborn’s Cot Mattress?
Firmness is a crucial factor when selecting the best cot mattress for a newborn baby due to safety and developmental reasons.
- Safety: A firm mattress reduces the risk of suffocation and Sudden Infant Death Syndrome (SIDS) by ensuring that the baby remains on a flat surface without sinking into the mattress. This allows for better airflow around the baby’s face and prevents them from getting trapped in soft materials.
- Support: Newborns require adequate support for their developing spines and muscles. A firm mattress promotes proper alignment and helps in the healthy development of the baby’s skeletal system, whereas a softer mattress may cause the baby to sink, leading to misalignment.
- Comfort: While firmness is essential, it is also important that the mattress provides a level of comfort. A mattress that is too hard may be uncomfortable for the baby, so finding a balance between firmness and comfort ensures they can sleep peacefully without distress.
- Durability: Firmer mattresses tend to be more durable and withstand the test of time, providing a reliable surface as the baby grows. A well-made, firm mattress can outlast softer alternatives, making it a cost-effective choice for parents.
- Easy Maintenance: Firm mattresses are often easier to clean and maintain, as they tend to have less give and are less likely to absorb spills and odors. This is particularly beneficial for parents dealing with the inevitable messes that come with a newborn.
How Does Mattress Firmness Affect a Baby’s Sleep Quality?
The firmness of a mattress plays a crucial role in a baby’s sleep quality, influencing safety, comfort, and support.
- Safety: A firm mattress is recommended for newborns as it reduces the risk of suffocation and Sudden Infant Death Syndrome (SIDS). Babies are at risk of rolling onto soft surfaces, which can obstruct their airways; thus, a firmer surface helps to keep them safely on their back.
- Support: A firm mattress provides the necessary support for a newborn’s developing spine. Infants have delicate bodies that need proper alignment, and a supportive mattress helps prevent issues related to spinal development, promoting healthier growth during those critical early months.
- Comfort: While firmness is vital, the right level of comfort also matters. A mattress that is too hard may not be comfortable for a baby, potentially leading to restless sleep; therefore, it’s important to find a balance in firmness that allows for comfort while maintaining safety.
- Temperature Regulation: Firmer mattresses often feature materials that promote better airflow and temperature regulation. This can help keep a baby comfortable throughout the night, which is essential for longer, uninterrupted sleep cycles.
- Durability: A firmer mattress is typically more durable, retaining its shape and support over time. As babies grow and begin to move around, a mattress that holds its integrity is crucial for continued safety and comfort.
What Are the Top Brands for Cot Mattresses for Newborns?
The top brands for cot mattresses for newborns are:
- Newton Baby: Known for its innovative design, the Newton Baby mattress features a breathable, washable cover that allows for airflow, reducing the risk of overheating. Its unique construction is also made from a lightweight material that offers firm support while being soft and comfortable for newborns.
- Naturepedic: Naturepedic mattresses are made from organic materials, ensuring that they are free from harmful chemicals and allergens. Their dual-sided design provides a firmer side for infants and a softer side for toddlers, making it a versatile option that grows with your child.
- Sealy: Sealy offers a range of cot mattresses that are known for their durability and support. Many of their models incorporate a waterproof cover and easy-to-clean surfaces, making them practical for busy parents, while providing the necessary firmness for safe sleep.
- Graco: Graco cot mattresses are often praised for their affordability and quality. They typically feature a high-density foam core that provides the necessary support for newborns, along with a removable, washable cover to maintain hygiene easily.
- Babyletto: Babyletto mattresses are designed with eco-friendly materials and often feature a combination of natural cotton and recycled materials. Their focus on sustainability and safety makes them a popular choice among parents looking for environmentally conscious options.
What Expert Recommendations Can Help Parents Choose the Best Cot Mattress?
When selecting the best cot mattress for a newborn baby, several expert recommendations can guide parents in making an informed choice.
- Firmness: A firm mattress is essential for a newborn’s safety and development.
- Breathability: Look for mattresses that allow for adequate airflow to help regulate the baby’s temperature.
- Materials: Choose hypoallergenic and non-toxic materials to ensure a safe sleeping environment.
- Waterproof Cover: A waterproof cover can protect the mattress from spills and accidents while maintaining hygiene.
- Size Compatibility: Ensure that the mattress fits snugly in the cot to prevent gaps where the baby could become trapped.
Firmness: A firm mattress is essential for a newborn’s safety and development, as it reduces the risk of suffocation and supports proper spinal alignment. Experts recommend that the mattress should not indent when the baby lies on it, indicating that it provides adequate support.
Breathability: Look for mattresses that allow for adequate airflow to help regulate the baby’s temperature. Breathable materials can help prevent overheating, which is a risk factor for Sudden Infant Death Syndrome (SIDS), ensuring a safer sleep environment.
Materials: Choose hypoallergenic and non-toxic materials to ensure a safe sleeping environment. Natural fibers and materials free from harmful chemicals are preferable, as they reduce the risk of allergic reactions and respiratory issues in sensitive infants.
Waterproof Cover: A waterproof cover can protect the mattress from spills and accidents while maintaining hygiene. This feature not only extends the life of the mattress but also makes cleaning easier for parents, which is vital during the early months of parenting.
Size Compatibility: Ensure that the mattress fits snugly in the cot to prevent gaps where the baby could become trapped. A properly fitting mattress is crucial for safety, as it minimizes the risk of the baby rolling into spaces that could pose a hazard.
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