CottonPremium Material: soft texture and the infant short romper is made of excellent cotton blend, skin-friendly, comfortable, breathable, light-weight and snugger fit, no any irration and harm to baby skinSuits to neutral infant boys. The newborn jumpsuit neck and snaps is designed with buttons, which is more convenient to change your baby clothes and diapers5 Sizes to Choose From: There are sizes that newborn, 3 to 6, 6 to 9, 9 to 12, 12 to 18, 18 to 24 monthsOccasion: daily life, such as newborn coming home from hospital, for premie, baby summer playwear and sleepwear, twins baby matching sets, baby photography clothes, after shower, baby announcement, gift, taking family shoots, baby lounge sets