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. EASY ON AND OFF - Comfortable U neckline makes it easy to pull these cute baby clothes over your little one’s head. BUM POUCH - A generous bottom comfortably covers a diaper or training pants. NO DRAWSTRING HOOD – Comfortable hood takes the chill off when the temperatures drop. STURDY CONSTRUCTION - These infant hooded, long sleeve bodysuits include reinforced snaps at the bottom and a neckline that retains its shape.