Tommee Tippee Closer to Nature Advanced Anti-Colic Bottle: Designed to mimic the natural latch and flex of breastfeeding, these bottles are gentle on baby's delicate palate and help reduce colic and discomfort. The unique anti-colic valve helps prevent air ingestion, leading to happier and more content babies. The 2x faster flow teats are perfect for older babies who are ready for thicker liquids. BPA-free for your peace of mind.