Gerber First Essentials Clearview Bottles have a vented nipple design that helps reduce colic by limiting the amount of air your baby swallows. These 5-ounce bottles come in a pack of (3) and are specially designed to prevent nipple collapse and leaking. The leak-proof hoods come in assorted colors and are topped with silicone nipples. These bottles are also BPA-free and fit most breast pumps. The NUK family of brands designs safe and fun products that encourage your baby's development. NUK is committed to nurturing your children's healthy transitions from birth to toddler and has worked for over 50 years to design high quality, innovative products that are scientifically proven to support safe and healthy development. </br>Features: </br>Helps reduce colic with vented nipple design for less swallowed air. Ribs and vent help prevent nipple collapse. Leak-proof hood. Fits most breast pumps. 5-ounce bottles come in a pack of (3) with silicone nipples.