The glass bottles feature a soft silicone nipple that supports your baby's individual sucking behavior. The opening of the nipple is designed to release milk only when your baby is actively drinking. This allows your baby to suck, swallow, and breathe at their own pace—just like breastfeeding. The Natural Response nipples are ideal for combining breastfeeding and bottle feeding. The particularly soft texture and wide design of the nipple mimic the feeling 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 food depends on how quickly or slowly your baby drinks. A slow flow is suitable for active, fast drinkers, while a fast flow is appropriate for slow and steady drinkers. Included is nipple stage 3 for babies from 1 month old. The high-quality, stable borosilicate glass of the bottles is heat-resistant, so you can store them in the refrigerator and warm them safely. Additionally, the baby bottle is microwave, dishwasher, and sterilizer safe. Thanks to the wide bottle neck, it is easy to fill and clean. Since the bottle consists of only a few parts, it can be quickly and easily assembled. Package includes: 2 glass bottles (240 ml), 2 silicone Natural Response nipples (stage 3), 2 screw rings, and 2 protective caps.