The shape, length and texture of the super soft silicone nipple mimics the mother's nipple in almond color, a sealed, flat, slanted and colored silicone nipple, the fruit of simple observation of nature, the anti-colic pouch contracts when the baby sucks, as do the mammary glands The bag does not need external air to compensate for the vacuum that occurs inside, which is why there are no bubbles This helps prevent colic gases in the baby, while preventing air from oxidizing the milk and destroying nutrients Made of semi-rigid, flexible and very durable silicone, the bag can be easily washed, without special cleaning accessories Suitable even for premature babies with low suction power