Intended for babies over the age of three months and has a medium flow.A large breast-shaped nipple encourages natural latch-on, allowing you to mix nursing and bottle feeding with ease. The incredibly delicate nipple feels like a breast. The comfort petals and our flexible spiral design allow for natural movement as baby eats. The nipple’s unique Airflex vent technology is meant to minimize colic and pain by venting air away from your baby’s belly.