60% Cotton, 37% Polyester, 3% Spandex Imported Zipper closure Machine Wash SHOP LESS, SPEND LESS - Get more growing time from each size. Size 0-6 fits 0 - 3 months AND 3 - 6 months; 6-12 fits 6 months, 9 months AND 12 months; 12-18 fits 12 months AND 18 months, 18-24 fits 18 months AND 24 months. STRETCHES TO FIT AS BABY GROWS - Lightweight, breathable 4-way stretch fabric encourages free-flowing movement and comfort as baby grows. SAFE & EASY - Zipper makes changing baby easier and our protective zipper panel and pocket keeps zipper away from baby's skin