GO ORGANIC - Incredibly soft organic cotton-rich fabric features just the right touch of spandex for easy movement. SNUG FIT - For your child's safety, the garment should fit snugly. This garment is snug-fit and free of flame-retardant chemicals. DESIGN DETAILS - Size 0-9 months feature hand mittens to protect Baby face and feet mittens for extra warmth. Sizes 12 - 24 months have stretch cuffs. SAFE & EASY - Our protective two-way zipper panel and pocket keep zipper away from Baby skin while making changing a breeze. STRETCHES TO FIT - Lightweight, breathable 4-way stretch fabric encourages free-flowing movement and comfort as baby grows. TRADITIONAL SIZING - This bodysuit is available in classic sizes, including 3 months, 6 months, 9 months, 12 months, 18 months, and 24 months.