Natural Bottle with Natural Response nipple Baby controls the pace, just like breastfeeding Designed with a unique opening and tip which only releases milk when baby actively drinks Easy to combine breast and bottle feeding with a wide breast-shaped nipple with a soft feel that mimics the shape and feel of a breast and baby controlling the flow of milk. No-drip nipple design helps prevent lost milk from the tip, giving you peace of mind Anti-colic valve is designed to reduce colic and discomfort by sending air away from your baby's tummy BPA Free