UK Perfect Match baby bottle teats are simply right for baby, thanks to their adaptive design. The bottle teat is uniquely soft and elastic, just like mum's skin, so that it gently moulds to any baby’s lips and palate. The smoothly tapering shape also makes it easy to latch on in the right way: mouth wide open with lips enclosing the teat. The Innovative Anti-Colic vent helps prevent the harmful swallowing of air, with different teat size options that regulate milk flow in the best way for your baby.Size U for independent speed control of food flow by babies from 6 months to include thickened feeds.