Now your baby can transition from breast to bottle in a natural way with the NUK Simply Natural Bottles. Designed to mimic the fit, flow, and movement of mom as closely as possible, this is the only bottle with up to 9 nipple holes, just like mom. This provides a natural feeding experience to ensure the mom-baby bond remains strong. NUK Simply Natural bottles feature a super-soft nipple that mimics the shape of mom's breast while breastfeeding. The scoop nipple cavity allows space for baby's tongue and jaw to move naturally, just like they do when breastfeeding. Now NUK Simply Natural bottles feature SafeTemp technology, which lets you know when milk is too hot. The blue thermometer indicator fades when milk is too hot and reappears when milk has cooled and is safe to drink.