your breasts don't have air-vents,
why should baby bottles?

Bare® air-free baby bottles closely mimic a mother’s breast and breastfeeding. Our Perfe-latch® nipple extends upon suction to emulate the mechanics of breastfeeding to minimize nipple confusion. With breakthrough Air-plug® technology that works similar to a syringe, Bare® dispenses air-free contents to your baby to help reduce gas/colic.

air-free milk + upright position
= best anti-colic bottle.