Inspired by moms and designed by experts, our Natural Start Anti-Colic Baby Bottle has an extra-wide neck and breast-like nipple to help your baby have the most natural bottle-feeding experience. Made from super soft silicone, the nipple is Closer to Nature because it has a special breast-like shape that encourages a natural latch and prevents nipple confusion when switching between bottle and breast. This works by mimicking the flex and movement of the mom’s breast, allowing your baby to feed at a pace that feels comfortable and natural to them. It also features an anti-colic valve to prevent the symptoms of colic by ensuring your little one ingests more milk and less air. For added peace of mind, the Natural Start baby bottle is completely mess-free and leakproof when the screw ring, nipple, and cap are all secured (even if it’s turned upside down or shaken). It’s also 100% BPA so it’s safe for your baby. However, you choose to feed your baby - whether it’s breast milk, formula, or a bit of both - our Natural Start Anti-Colic bottles are #1 for easily switching between bottle and breast