The Tommee Tippee Closer to Nature Anti Colic Bottle is intuitively designed for babies with excessive spit up, fussiness and gas. The super sensitive anti colic valve provides optimum venting during feeding and the soft, natural shaped nipple mimics the feel, flex and movement of breastfeeding, similar to mum's own natural feeding action. All features combined gives baby the most natural alternative to breastfeeding and helps provide baby with a comfortable, stress free feed.