This set comes with five bottles, including three 4oz. and two 9oz. bottles flexible breast-shaped nipples mimic breastfeeding, allowing your baby to control the flow without being overwhelmed or underfed Anti-colic valve, built into the nipple, prevents your child’s tummy from filling up with air Replacement nipples allow you to easily keep up with your child’s development Cleaning brush features a curved head and a molded tip, to let you easily clean all parts of the bottle and nipple Soothie pacifiers are widely used by medical professionals to calm newborns Set includes these items: three 4oz. natural bottles with Natural Response Nipples Flow 2, two 9oz. Natural Bottles with Natural Response Nipples Flow 3, a Natural Response Nipple Flow 1, a Natural Response Nipple Flow 4, seven sealing discs, two Soothie pacifiers 0-3 months+, and a bottle brush