The Natural Response Silicone Teat 4-pack from Avent mimics the feeling of breastfeeding to facilitate the combination of breastfeeding and bottle feeding. The opening of the teats is designed to release milk only when your baby is actively drinking. This allows your baby to suck, swallow, and breathe at their own individual pace—just like breastfeeding. The particularly soft texture and wide design of the teat resemble the feeling of the mother's breast. The anti-colic system reduces the risk of your baby swallowing air while drinking, thus preventing colic and discomfort. The optimal flow of milk depends on how quickly or slowly your baby drinks. A slow flow is suitable for active, fast drinkers, while a fast flow is ideal for slow and steady drinkers. The opening of the teat stage 5 allows for a faster milk flow and is suitable for babies from 6 months old. Package includes: 4 Silicone Teats Natural Response – Teat Stage 5.