It's clear that the First Essentials by NUK? Clear View Bottle is ideal for your baby. Whether at home or on-the-go, feeding time is made simple with a colic-reducing vented nipple. The leak-proof silicone nipple with a medium flow has a ribbed design to prevent the nipple from collapsing. In a pack of 3, the baby bottles hold up to 9 ounces of liquid.