The BPA-free yoomi bottle is ergonomically designed for superior comfort. It has a soft silicone teat which resembles the contours of mum's breast and the built-in anti-colic vents help prevent baby from experiencing colic. Baby will be comforted by the ability to latch on easily, making it simpler to combine breast and bottle feeding. The yoomi bottle also works perfectly with the yoomi warmer (sold separately).