Healthy active feedingthe philips avent classic medium flow teat has a soft wide shape which encourages your baby to open the mouth wide when feeding and to literally latch on to the teat he or she can then suckle using the same movements of their tongue and jaw as they do when breastfeedingbpa free teat allows your baby to control milk flow more like breastfeeding which can help reduce overeating and spit up a unique skirt system flexes to allow air into the bottle and promotes health