Description Avent Natural Response Baby Bottle with Pattern with AirFree Valve 260ml 1 Month and + is a bottle with a Flow 3 teat, designed to reduce colic, gas and reflux. The Natural Response teat adapts to baby's natural feeding rhythm, making it easier to alternate between breast and bottle feeding. The teat has a unique opening that allows milk to flow only when baby is actively drinking. This means baby can stop to swallow and breathe, and the flow stops too. The teat is wide, soft and supple to mimic the shape of the breast. The AirFree valve is designed to provide better protection against colic, gas and reflux by keeping the nipple full of milk to facilitate feeding in a sitting position and limit air ingestion.