Optimal Mamilla Extra Wide Neck Feeding Bottle 0+ Blue made of polypropylene with a silicone nipple, it stretches and bends gently during feeding. It is designed in a shape similar to the mother’s breast, which makes it easier for the baby to combine breast and artificial feeding , suitable for children from 0-6 months old , the nipple is made of soft silicone and features a safe flow of milk for babies with very wide neck, it has an Anti-Colic dual valve that relieves colic and discomfort by letting air into the bottle instead of the baby’s tummy , and the nipple is wide and safe and does not affect the health of the natural growth of the baby’s teeth and gums , in addition its easy to use and clean Safe for children. Also its free of Bisphenol A (BPA), phthalates, and PVC .