Baby Bottles Glass Bottle 2-Pack Natural Response 120ml + Silicone Nipple. Key Features at a Glance: for babies from day one with a slow flow rate, soft silicone nipple supports your baby's individual sucking behavior, breastfeeding and bottle feeding can be easily combined, anti-colic valve reduces air swallowing, wide-neck bottles made of high-quality borosilicate glass. For a natural drinking experience. The glass bottles come with a soft silicone nipple that supports your baby's unique sucking behavior. The opening of the nipple is designed to release milk only when your baby actively drinks. This allows your baby to suck, swallow, and breathe at their own pace—just like breastfeeding. This makes it easy to combine breastfeeding with feeding using baby bottles with the Natural Response nipples. The particularly soft texture and wide design of the nipple mimic 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 food flow 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. Included is nipple level 2 for babies from birth. The high-quality, stable borosilicate glass of the bottles is heat-resistant—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 assembled quickly and easily. Package includes: 2 glass bottles 120 ml, 2 silicone Natural Response nipples level 2, 2 screw rings, 2 protective caps.