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. Contains three 10-oz Smooth Flow bottles.