- Overall Length - Head to Toe: 52''
- Mattress Fill Material: Cotton
- Hypoallergenic: Yes
- Antimicrobial: Yes
- Organic: Yes
- The Lullaby Cotton Crib Mattress is filled with only one ingredient 100% USDA Certified Organic Cotton. This crib mattress is 4 inches thick and is designed to be firm according to standards agreed upon by pediatricians. To ensure firmness and provide proper support for your baby the Lullaby Cotton Crib Mattress has been tufted over 312 times.