The Crane 5 oz. Wide-Neck Breast Milk Bottle Nipples helps promote easy feeding time with your little one. Designed with a wide neck and an anti-colic valve that keeps the nipple full of milk and not air, this bottle makes feeding easier for your child. Designed to perfectly fit on the Crane Wide-Neck Breast Milk Bottle with three different size options. The silicone material allows for your child to have a comfortable, problem-free feeding experience.