Part of the Glass Natural collection Suitable for ages zero to three months Includes three 4oz. (125ml) baby bottles and Flow 2 natural response nipples that allow babies to control the milk flow, similar to breastfeeding Wide, breast-shaped nipple gives a soft, natural feel to babies for easy bottle-feeding No-drip nipple design prevents milk spills, ensuring a mess-free feeding experience Anti-colic valve sends air away from your baby's tummy, reducing discomfort caused by colic Made from premium quality borosilicate glass for enhanced durability BPA, PVC, and phthalate-free construction means your baby's food is safe from all harmful chemicals Heat and thermal shock-resistant design ensures safe use in the microwave, fridge, and dishwasher. So, you can easily warm, refrigerate, or sterilize the bottle