The Newton Baby Bassinet Mattress is our overall winner for its breathable core, dual-sided firmness, and waterproof zippered cover. Alternatively, the Dream On Me 2-Inch for budget-friendly value with CertiPUR-US foam and a washable cover.
Finding a 36 x 18 bassinet mattress that fits snugly, supports safe sleep, and stands up to daily use can be tricky. Our research team compared over a dozen models based on specs, certifications (CertiPUR-US, OEKO-TEX, GREENGUARD Gold), firmness ratings, and thousands of aggregated owner reviews. We ranked the top seven to help you choose the safest and most comfortable option for your newborn.
Every mattress on this list meets the federal safety requirement for firmness, but they vary in materials, from breathable mesh cores to dual-sided designs that transition into toddlerhood. Owners consistently prioritize easy-to-clean covers, non-toxic materials, and a snug fit that leaves no gaps around the bassinet edges. Below, we break down the best picks for every need.
Newton Baby Bassinet Mattress
The Newton Baby features a unique breathable core that allows airflow even if baby rolls onto their tummy. It's dual-sided with infant firmness and a slightly softer toddler side. The waterproof, zippered cover is machine-washable and GREENGUARD Gold certified.
How we research and rank
We do not take payment for placement and we do not physically test products. Rankings come from manufacturer specifications, material certifications (CertiPUR-US foam, OEKO-TEX textiles), and thousands of aggregated owner reviews analyzed for durability, heat retention and sagging.
The picks, compared
Newton Baby Bassinet Mattress
Parents who want the safest, most breathable mattress with a waterproof cover · Type: Breathable foam core with mesh | Firmness: Firm for infants, medium-firm for toddlers | Trial: 100 days
The Newton Baby features a unique breathable core that allows airflow even if baby rolls onto their tummy. It's dual-sided with infant firmness and a slightly softer toddler side. The waterproof, zippered cover is machine-washable and GREENGUARD Gold certified.
What owners report: Owners rave about the peace of mind from the breathable design and how easy it is to clean. Many note that it fits standard bassinets perfectly without any gapping.
- Breathable core for extra safety
- Dual-sided for infant and toddler use
- Machine-washable zippered cover
- Higher price point
- Cover can wrinkle after washing
Dream On Me 2-Inch Bassinet Mattress
Budget-conscious parents seeking a firm, non-toxic option · Type: Foam | Firmness: Firm | Trial: 30 days
This 2-inch thick mattress is made from CertiPUR-US certified foam that’s firm and supportive. It features a waterproof PVC cover that wipes clean easily. Lightweight and fits most standard bassinets.
What owners report: Owners appreciate the low price and easy wipe-down surface. Some report that the cover is not as soft as higher-end models, but it’s durable and practical.
- Very affordable
- CertiPUR-US certified foam
- Waterproof, easy-clean cover
- Thinner than some bassinet mattresses
- Cover may be less breathable
Colgate EcoClassica III Bassinet Mattress
Babies who sleep hot or in warmer climates · Type: Polyethylene core with organic cotton cover | Firmness: Firm on both sides | Trial: 90 days
The Colgate EcoClassica III uses a breathable layer of organic cotton and a cooling cover to regulate temperature. It's made with food-grade polyethylene core that’s Greenguard Gold certified. The mattress is reversible with two firmness levels.
What owners report: Owners report that the cooling cover really keeps babies from sweating. Many also like that it’s recyclable and non-toxic.
- Cooling organic cotton cover
- Reversible firmness levels
- Greenguard Gold certified
- Price is mid-to-high
- Core is plastic-based, which some may dislike
Graco Premium Foam Bassinet Mattress
Parents seeking a reliable, low-cost option from a trusted brand · Type: Foam | Firmness: Firm | Trial: 30 days
Graco’s foam mattress is 2 inches thick, firm, and wrapped in a waterproof cover. It's CertiPUR-US certified and fits most bassinets. The lightweight design makes changing sheets a breeze.
What owners report: Owners say it’s a great basic mattress that does the job without breaking the bank. Some mention it could be thicker for deeper bassinets.
- Very low price
- Lightweight and easy to handle
- Waterproof cover
- Thinner than 3-inch options
- Cover may have a slight chemical smell at first
Milliard Bassinet Mattress with Washable Cover
Parents who want an extra-firm surface for safe sleep · Type: Foam | Firmness: Firm | Trial: 30 days
The Milliard mattress uses high-density foam that’s extra firm and CertiPUR-US certified. It comes with a removable, machine-washable cover that’s waterproof and soft. The 2-inch thickness fits many bassinets.
What owners report: Owners appreciate the extra firmness that meets safety guidelines without being rock-hard. The removable cover is a hit for easy cleaning.
- Extra firm for safety
- Removable and washable cover
- Affordable
- Not dual-sided
- May be too firm for some toddlers
Serta Perfect Start Ultra Firm Bassinet Mattress
Parents who want a mattress that resists sagging and lasts through multiple kids · Type: Innerspring with foam | Firmness: Firm | Trial: 30 days
This Serta model combines a steel coil innerspring with foam layers for durability and firmness. The waterproof cover is quilted for comfort. It’s CertiPUR-US certified and fits standard bassinets.
What owners report: Owners say the innerspring construction feels more supportive than all-foam options and holds up well. Some note it’s heavier to lift.
- Innerspring for long-lasting support
- Quilted waterproof cover
- Firm and supportive
- Heavy compared to foam
- Price is higher than average foam
Delta Children Bassinet Mattress
Babies who prefer to sleep on their side (once they can roll safely) · Type: Foam | Firmness: Medium-firm | Trial: 30 days
Delta Children’s mattress is made with high-density foam that contours slightly to support side sleeping during approved sleep positions. The cover is waterproof and removeable. It’s Greenguard Gold certified for low VOCs.
What owners report: Owners note that the slight give helps babies who side-sleep feel comfortable. The cover is easy to unzip and clean, but some wish it were thicker.
- Slight contouring for side sleepers
- Greenguard Gold certified
- Waterproof cover
- May not be firm enough for very young infants
- Thinner than 3-inch options
Frequently asked questions
What is the standard size for a bassinet mattress?
Most bassinet mattresses are 36 x 18 inches, but always measure your bassinet to ensure a snug fit. A gap of more than two fingers between the mattress and bassinet sides can be a suffocation risk.
How firm should a bassinet mattress be for a newborn?
A bassinet mattress should be firm to reduce the risk of SIDS. When you press on the mattress, it should not indent significantly. Firm mattresses provide a safe, flat sleeping surface as recommended by the AAP.
Are all bassinet mattresses waterproof?
Most have a waterproof cover or a waterproof layer, but not all. Always check product details. A waterproof cover is important to protect the mattress from leaks and make cleaning easier.
What certifications should I look for in a bassinet mattress?
Look for CertiPUR-US for foam safety, GREENGUARD Gold for low emissions, and OEKO-TEX for fabric purity. These certifications indicate the mattress has been tested for harmful chemicals.
Can I use a bassinet mattress for a toddler?
Some bassinet mattresses are dual-sided with a toddler firmness level, but most are designed only for infants. If you plan to use the mattress as a toddler transitions to a crib, choose a model that explicitly states it’s suitable for toddlers.
The verdict
The Newton Baby Bassinet Mattress takes the top spot for its breathable safety, dual-sided design, and easy maintenance. For budget shoppers, the Dream On Me 2-Inch offers great value at a low price. And if your baby runs hot, the Colgate EcoClassica III’s cooling cover is a standout choice.
