The Twinkle Twinkle Peaceful Sleep Baby Crib Mattress will help your little one sleep restfully at night and naptime. One side of the mattress is firm for the first year of development while the other side is softer for toddlers 12 months and up. The foam mattress is crafted from resilient, high-quality foam with enhanced airflow and comfort. • Firm foam mattress ideal for infants • 99.9% VOC Free • Waterproof exterior • Lightweight core for easy bedding changes • Fits standard sized cribs • Dimensions: 51.7"L X 27.7"W X 5"H • Made in Canada