Helping your baby breastfeed for longer! BPA free for total reassurance. Designed in conjunction with breastfeeding experts, the revolutionary new 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 unique shape of the Closer to Nature easi-vent teat encourages your baby's natural feeding action so that switching between breast and bottle becomes second nature. The Closer to Nature 150ml bottles have also been designed for smaller expressed breast milk feeds. Their unique shape allows the bottle to be held closer into the body therefore allowing dads to enjoy a closeness with baby during feeding normally reserved for breastfeeding mums. With its unique anti-colic valve which you can actually see working, the Closer to Nature bottle is at the heart of an entire breastfeeding support system which also includes a breast pump, sterilisers and accessories specially created to help you combine breast and bottle feeding.