MAM Anti-Colic Bottle MAM Anti-Colic Bottle helps prevent gas and spit ups with its one-of-a-kind venting system that minimizes the amount of air baby swallows while drinking. The orthodontic nipple is made of soft silicone. Why You"ll Love It: It helps prevent gas and spit ups while your baby is drinking. FeaturesEasy-to-fill bottleEasily readable measurement markingsValve has anti-colic function and helps prevent gasBase is vented and helps regulate milk flow and air pressureBPA-freeBoy designs may vary. Please let us choose for you.