Crib vs Twin vs Single Mattress: How to Choose

By Hatchery Cribs Singapore | Published: 2026-10-27

Category: Buying Guides

Not sure which mattress size fits your child's bed? Compare crib, twin, and single mattresses by size, firmness, and age to make the right choice.

Quick Answer

Choose a crib mattress for infants and toddlers up to 3 years, then move to a twin or single mattress depending on your bed frame and space. For growing kids, a twin mattress offers more room, while a single mattress fits standard single beds and is ideal for older children and teens.

Why Size Matters

The right mattress size ensures safety and comfort. A crib mattress must fit snugly inside the crib to prevent gaps where a baby could get trapped. Twin and single mattresses are larger and used for toddler beds, daybeds, or standard single beds. Knowing the exact dimensions of your bed frame is the first step before buying any mattress.

Firmness and Age

Infants need a firm, flat surface to reduce the risk of suffocation and SIDS. As children grow, they may prefer a slightly softer feel, but support is still key. Crib mattresses are typically extra firm, while twin and single mattresses offer a range of firmness levels. Always check the mattress's firmness rating and certifications to ensure it meets safety standards.

Durability and Longevity

A good mattress should last through the years. Crib mattresses often have waterproof covers and are designed to withstand spills and accidents. Twin and single mattresses may not have waterproof layers, so consider adding a mattress protector. Investing in a durable mattress can save money in the long run, but remember that your child's needs will change as they grow.

Decision Rules for Choosing a Mattress

If your child is under 3 years old: Choose a crib mattress that fits snugly in the crib with no gaps. Look for extra firm support and certifications like GREENGUARD Gold or CertiPUR-US®. Measure your crib interior before purchasing.
If your child is transitioning to a toddler or twin bed: Consider a twin mattress if the bed frame is a standard twin size. Look for medium-firm support to accommodate growth. Check the bed frame dimensions and ensure the mattress is at least 5 inches thick for safety.
If your child has a single bed: A single mattress is designed for standard single bed frames. Consider pocket spring options for better support and comfort. Verify the exact dimensions of the single bed frame before ordering.

Mattress Options to Consider

DaVinci Deluxe Coil Crib Mattress | Extra Firm, Dual-Sided, Waterproof (130x70cm): The DaVinci Deluxe Coil Crib Mattress is extra firm, dual-sided, and waterproof, with 160 coils and a GREENGUARD Gold certification. This is a safe, supportive choice for infants and toddlers, and the waterproof cover makes cleanup easy.
DaVinci Deluxe Coil Crib Mattress | Extra Firm, Dual-Sided, Waterproof (130x70cm)
Babyletto Essential 7.5" Twin Kids Mattress (75"L x 38"W / 190.5cm x 98cm): The Babyletto Essential 7.5" Twin Kids Mattress offers medium-firm support and is CertiPUR-US® certified. It's a comfortable and safe option for older kids transitioning to a twin bed, providing support for growing bodies.
Babyletto Essential 7.5" Twin Kids Mattress (75"L x 38"W / 190.5cm x 98cm)
[Showroom Piece] Boori Single Bed Pocket Spring Mattress (188x90cm): The Boori Single Bed Pocket Spring Mattress features pocket springs that work independently to provide targeted support. This is a great choice for a single bed, offering personalized comfort for older children and teens.

Who Should Choose Which Mattress

Best For

Parents of infants and toddlers needing a safe, firm crib mattress
Families with a twin bed frame looking for a comfortable, supportive mattress for kids
Older children and teens with a standard single bed who need durable support

Not For

Crib mattresses are not suitable for older children who have outgrown the crib
Twin mattresses may not fit single bed frames without adapters
Single mattresses are not recommended for cribs or toddler beds