NUK Smooth Flow Bottles are the anti-colic solution for bottle feeding, featuring a unique nipple design that allows baby to control the flow rate for colic-free feeding. Unique Smooth Flow bottle nipple design allows baby to control the speed of the flow of milk for colic-free feeding. SafeTemp Indication: thermometer icon on bottle changes color when milk is too hot. Accepted by 98% of babies, based on market research, 2019, tested with 145 bottle users. Bottle nipple mimics the shape of mom's nursing nipple during breastfeeding, for a smooth transition from breast to bottle and back. Wide neck bottle is easy to clean and dishwasher-safe. Drinking hole is positioned correctly when NUK logo on nipple is under baby's nose. Includes 3 10-oz. bottles with Smooth Flow nipples.