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. Multiple nipple holes provide a natural feed, just like mom SafeTemp indicator changes color when milk is too hot Nipple comes with 3, 6, or 9 holes 5-oz. bottle has 3 holes, 9-oz. has 6 holes 1-piece Anti-Colic Air Vent reduces colic, gas, and spit up Same shape as mom’s nursing nipple Flexible nipple moves with baby for a continuous latch Odor- & stain-resistant Tritan® bottle is BPA-free Available in boy, girl, and gender-neutral fashions Available in 5-oz. and 9-oz. sizes