Premature,newborns,infants,toddlers even kids. You can use baby bottles soap and brush set to wash and put bottles on the drying rack. Dishwasher(top rack) and hot water (3-5mins)safe. BPA-free bottles are the perfect match to the most baby bottle warmer. Carefully selected material and strictly controlled quality, so these baby bottles are a safe choice for baby girls, baby boys, especially in the first year. Wide neck baby bottles-the small baby bottle is slow flow, the large baby bottle is variable flow(medium or fast flow). The newborn feeding bottles parts are only inclusive of 4bottle accessories - dustproof caps, natural nipples, collars, bodies, as to wash and clean simply. The naturally shaped, soft, silicone nipples design to most closely breast pumps. They are great breastfeeding stools. Anti-colic vent balance pressure and prevent air to reduce colic and flatulence. The clear infant bottle can be a water bottle, milk bottle, food bottle, breastmilk bottle and give you a better view than a silicone bottle.