Philips Avent All in One set with Natural bottles with the Natural Response nipple that lets baby control the pace of the milk, like they do when breastfeeding. The nipples' unique opening and tip only releases milk when your baby actively drinks. When pausing to swallow and breathe,no milk flows. Baby can drink, swallow, and breathe using their natural rhythm, just like they do when breastfeeding. The wide breast-shaped nipple mimics the soft feel and shape of the breast. The no-drip nipple design helps prevent lost milk from the tip. An anti-colic valve integrated into the nipple is designed to reduce colic and discomfort by sending air away from baby's tummy. Sealing discs turn bottles into storage containers, store or feed with the bottle. The bottle warmer is designed to heat milk quickly. A bottle brush with a curved brush head for cleaning of rounded edges and a molded tip to clean nipples. Sterilize baby products in reusable Microwave steam sterilizer bags. A Snuggle pacifier holder helps babies feel secure and makes finding the pacifier easy. Calm baby with a Ultra soft pacifier or a Soothie pacifier. Includes: 2 4oz Natural bottles with Natural Response nipples flow 2, 2 9oz Natural bottles with Natural Response nipples flow 3, 1 bottle warmer, 1 bottle brush, 5 microwave steam sterilizer bags, 4 sealing discs, 1 Snuggle pacifier holder, 1 Soothie pacifier 0-3 months, and 1 ultra soft pacifier 0-6 months. SCD839/01 What to expect when introducing the Philips Avent Natural Response Nipple. It is totally natural for your baby to take 2-3 tries to get milk flowing from a new bottle. Unlike traditional bottles the Natural bottle is designed to only release milk when your baby is actively drinking, like what happens when babies breastfeed. We have 5 different nipple flow rates. When looking for a nipple flow rate, age is a guide, but your baby's approach to drinking and their feeding cues will help determine when to move to a higher or lower nipple flow rate.