Gerber onesies one-piece underwear is an essential in your baby's wardrobe. They are great to use as a layering piece under your favorite outfits to keep baby's tummy extra warm. Made of 100-percent cotton for comfort and softness, they have a lap shoulder neckline for ease of dressing, hems that are double stitched to keep smooth after excessive washings and a snap closure conveniently positioned for ease of changing baby's diaper. 4 pack available in sizes 12, 18 and 24 months. Machine wash and dry.