AntiColic Glass Baby Bottles 4 oz and 8 oz Our newborn baby bottles feature an innovative double anticolic valve ensuring natural milk flow to prevent discomfort and reduce spitup Safe and Durable Made from thermal shockresistant borosilicate glass these slow flow baby bottles are free from harmful chemicals offering a safer option for your babys feeding needs Natural Feeding Experience These anticolic bottles provide a familiar feeding experience with natural rubber nipples that mimic breastfeeding easing the transition from breast to bottle Convenient and Versatile From freezer to refrigerator to hot water these 8 and 4 oz baby bottles simplify storage and preparation of breast milk Dishwasher and microwave safe for added convenience Complete Set for HassleFree Feeding On the Go 2 breastfeeding bottles natural rubber nipples anticolic double valves threaded bottle rings bottle seals for storage and snugfit caps for travel