Designed to feed baby naturally, these Philips AVENT large teats which mimic the shape of the breast helps baby to learn to alternate between breastfeeding and bottles. PLUS POINTS: Ergonomically shaped for extra comfort. Soft flexible teats and refined anti-colic valves ensure air enters the bottle and not baby's tummy. Set of 2 available in 4 sizes: 1) 1 hole (soft flow), suitable from birth. 2) 2 holes (slow flow), suitable from 1 month. 3) 3 holes (average flow), suitable from 3 months. 4) 4 holes (fast flow), suitable from 6 months. In silicone guaranteed BPA-free. 2-year warranty.