Designed in conjunction with breastfeeding experts, the Tommee Tippee Closer to Nature easi-vent teat mimics the natural flex, movement and softness of a mum’s breast, to make switching between breast and bottle easier than ever before. The Closer to Nature 260ml bottles have been designed to be held in the most natural positions during feeding and can be held in 3 ways: cradles comfortably in the hand, gripped in the same way as a traditional wide neck bottle and held from the base. They also have an anti-colic valve which you can actually see working.