Choose the MAM Easy Start Dual Anti-Colic+ Baby Bottle for fewer fussy feedings and an easier switch between breast and bottle. The vented base, clinically shown to reduce colic symptoms in 80% of babies, works with the SkinSoft™ nipple to keep air moving out of the bottle, so feeding stays steadier with fewer pauses and gulps. MAM studied nursing babies with ultrasound technology to design a nipple shape that closely mimics a mother's breast, giving it a 94% acceptance rate and making this bottle a great fit for newborns and mixed feeding routines. This 4.5oz bottle ships with a MAM Level 1 nipple, but we recommend starting newborns at Level 0 (Extra Slow Flow) instead, since MAM nipples run faster than most brands. One bottle grows through every MAM anti-colic nipple flow rate fit, so you'll never need to buy another. The bottle is dishwasher safe and also includes a built-in self-sterilizing feature: add water, assemble, and microwave for 3 minutes, and it stays sterile for up to 48 hours if untouched. After cleaning or sterilizing please follow these simple steps to put your MAM Easy Start Dual Anti Colic+ Bottle together. Following these steps will ensure trouble free use and no leaks. Starting with the bottle base place the Anti-colic valve in the base with the ""THIS WAY UP"" message visible. Do not push it down. Instead take the bottle cap, holding it by the top and gently push down on the anti-colic value so it fits snugly. Next screw the bottle body into the base so it is tight. Look inside the bottle, the valve should sit cleanly and snug inside the bottle with no little snags in the joint between the bottle body and the base. Finally, fit the nipple through the bottle top and fit to the bottle and add the bottle cap. Made in Europe from bio-circular, BPA- and BPS-free materials, MAM Easy Start Anti-Colic+ bottles are tested to exceed American and European safety standards and have been trusted by millions of parents for 50 years.