The Tommee Tippee Closer to Nature® Anti-Colic Decorated Feeding Bottles are intuitively designed for easier and more natural feeding. The bottles nipple mimics he natural feel, flex and movement of breastfeeding, making the transition to bottle feeding that much easier. The wide neck on the nipple also allows for your baby to latch on easier. The Closer to Nature® Anti-Colic, anti-gas, advanced easi-vent™ valve prevents baby from ingesting air that can cause discomfort. These bottles also come with a hygiene cap that is great for keeping the nipple clean and sanitary.