Hegen’s Extra Slow Flow teat is suitable from birth (even for premature or low birth weight babies) as it mimics the initial flow of transitional breast milk. Hegen's teats are designed to encourage seamless transition from breast to bottle feeding, minimising nipple confusion for your baby. Our velvety soft, elliptical shaped teat closely mimics a mother's lactating breast while the offcentre teat design promotes upright feeding similar to a position in which babies are nursed to reduce the risk of milk backflow and resulting midear complications and colic. The builtin anticolic air vent reduces unwanted air intake and prevents bubbling of milk, saving precious nutrients from oxidation. Additional teats of various sizes (all sold separately) allow mothers to simply swap to their choice of teats for baby’s perfect feed as time goes by. Simply assemble the teat into the collar and your Hegen bottle instantly becomes a feeding lid for baby.