Twistshake’s glass baby bottle is made from borosilicate glass, which is extra durable and lightweight. The baby bottle is ergonomically designed to provide the best possible grip and is enclosed in a protective, BPA-free and removable silicon casing that protects small hands against heat. This baby bottle is perfect for a breastfeeding baby since the teat closely resembles the mother’s breast and prevents baby colic with a smart anti-colic valve that stops unnecessary air from reaching your baby’s sensitive tummy. Of course, it is possible to replace the teat with any of our other teats, so that your child can grow with the bottle. This baby bottle is naturally odorless and is free from harmful chemicals such as BPA, PVC, and phthalates. The silicon has volume markings in both ML and US FL. The baby bottle can be warmed in a microwave oven and can cope with the transition from frozen to boiling water thanks to its heat-resistant properties. Since the bottle is made from borosilicate glass, it is also scratch-resistant. The glass bottle can be washed by placing it on top in a dishwasher, although we recommend that its other parts should be washed by hand since they could become discolored if washed in a dishwasher. Teat in size M (2+ m) with an integrated anti-colic system included.