Vented nipple helps reduce colic Ribbed nipple design helps prevent nipple collapse Leak-proof silicone nipple with sealing hood; slow flow BPA-free and dishwasher safe 5 oz. bottles in a pack of 3; colour may vary 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 slow flow has a ribbed design to prevent the nipple from collapsing. In a pack of 3, the baby bottles hold up to 5 ounces of liquid.