Breastflow supports every feeding choice. Whether you’re supplementing, formula feeding, or weaning, your baby will love Breastflow since it’s the only bottle designed to work just like the breast. Unlike traditional bottles, Breastflow is designed so your baby uses two motions - suction and compression. These two motions allow your baby to instinctively control the milk flow just like breastfeeding. For complete feeding flexibility, Breastflow works perfectly with breastmilk or formula. The silicone, vented nipple is designed to help reduce colic symptoms, gas and spit up. And, the unique, patented two piece nipple and wide neck design is a cinch to assemble and easy to clean by hand or in the dishwasher. Breastflow bottle covers snap on the bottom of the bottle to help keep you from losing it when on the go. And the included container for formula or snacks conveniently snaps on the bottom too! The Breastflow Starter Set includes two 5 ounce bottles.