The Munchkin LATCH Bottle is designed to help you reach your breastfeeding goals. Experts agree that a better latch eases the transition between breast and bottle, and back. Thats why our accordion teat pumps and moves just like the breast, stretching back to your babys soft palate for a correct latch. This BPA-free Bottle Starter Set has all of the essentials you will need for your newborn baby. Includes: 2x 4oz latch bottles. 2x 8oz latch bottles. 4x latch stage 1 (slow flow) teats. 2x latch stage 2 (medium flow) teats. 1x latch bottle and valve brush. Better latch: proper latch is achieved when mums teat reaches all the way back to babys soft palate. The accordion-style teat on latch stretches like the breast, helping baby latch easily and correctly. Like the breast: when breastfeeding, baby controls the flow of milk by applying pressure to the base of mums teat. The latch bottle mimics mum by releasing more breast milk as baby pushes against the teats base. Less colic: while feeding, the accordion-style teat flexes as baby moves her head. This allows baby to maintain her latch, thus decreasing ingestion of air. Anti-colic valve: he one-way, anti-colic valve located at the bottom of the latch bottle allows for breast milk to flow while ensuing air bubbles do not travel through the breast milk. Grow with baby: the best transition between breast and bottle occurs when bottle flow and mothers flow match. Since all babies are different, this package includes an assortment of teats that allows you to try different flow rates to best meet your babys needs. General information: Suitable from birth.