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 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. Thanks to its brand-new design, the Natural Start baby milk bottle is now self-sterilizing, making clean-ups a whole lot easier. Follow these simple steps to sterilize your bottle in the microwave in just 3 minutes*:Step 1: Thoroughly clean your bottle in warm, soapy water and rinseStep 2: Fill the bottle with 50ml of cold waterStep 3: Loosely place the nipple, screw ring and cap back onto the bottle and pop in the microwave for 3 minutesStep 4: Remove the water inside the bottle and reassemblePlease note that the time to sterilize will change slightly based on how many bottles you place in the microwave at once.For added peace of mind, the Natural Start baby bottle is completely mess-free and leakproof when the screw ring