The Natural Response Silicone Teat 4-pack from Avent mimics the feeling of breastfeeding to facilitate the combination of breastfeeding and bottle feeding. The teat's opening 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 sensation of the maternal 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 fast or slow 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 Stage 4 teat allows for a controlled, medium flow of milk and is suitable for babies from 3 months old. Package includes: 4 Natural Response Silicone Teats – Stage 4.