The NUK Smooth Flow Bottle is the anti-colic solution for bottle feeding. This bottle features a unique nipple design that allows your baby to control the flow rate for colic-free feeding. The bottle also features a safe temperature indicator. Uniquely designed anti-colic bottle that make feeding easy and comfortable for your baby. 3-pack. Stage 1 (slow flow). Unique nipple design allows your baby to control the speed of the flow of milk for colic-free feeding. Nipple mimics the shape of mom's nursing nipple during breastfeeding, for a smooth transition from breast to bottle and back. Safe Temperature Indicator on bottle changes color when milk is too hot. Wide neck bottle is easy to fill and clean. Drinking hole is positioned correctly when NUK logo on nipple is under baby's nose. Suitable for babies from birth to 12 months. Accepted by 98% of babies based on 2019 market research. BPA free. Plastic. Dishwasher safe. 5 oz. capacity each. Measures 2.63 " L x 7.69 " W x 6.13 " H each. Made in USA of U.S. and imported materials.