The range of bottles that mimic breastfeeding. the nipples are made of very soft, silky silicone, to ensure a natural feeling during feeding. ideal for switching between breastfeeding and bottle feeding. protection against colic the double anti-colic valve prevents air from entering and ensures maximum protection against colic and aspiration. elongated nipple with round base the base is wide and rounded, with adjustable flow, ideal for feeding babies after a few months.