Silicone nipple

1.two(or three) air valves at base, flexes to allow air into bottle , babies feed continuously without having to “coming up for air� because the air is being released into the bottle-not into the milk or babies�tummy, reduce colic in newborn babies. 2. with four powerful poles, which make the teat not collapse easily. 3. softness, smooth and easily to clean. 4. high transparence