Aiwibi baby feeding bottles use safe and reliable baby bottle materials. Our wide-necked bottle design make cleaning easier and do not produce harmful substances. The soft silicone breast-like nipple design is close to the skin and curved to provide comfort during feeding and support during the transition from breast feeding to bottle feeding. Air is exchanged through a vent in the bottle nipple cap to balance pressure and effectively reduce your baby’s flatulence, hiccups, and vomiting symptoms.