Nuk Simply Natural Glass Baby Bottles, 4 Oz, 3 Pack Now your baby can transition from breast to bottle in a natural way with NUK Simply Natural glass bottles. Designed to mimic the fit, flow, and movement of mom as closely as possible, This is the only bottle with up to nine nipple holes, just like mom. This provides a natural feeding experience to ensure the mom-baby bond remains strong. Our bottles feature an even softer nipple than before. NUK Simply Natural nipples mimic the shape mom's breast takes while breastfeeding. The scooped nipple cavity allows space for baby's tongue and jaw to move naturally, just like they do when breastfeeding. Advanced 1-Piece Anti-Colic Air system helps reduce colic, gas, and spit up for greater comfort and fewer messes Flexible nipple allows for a continuous latch and is the same shape as mom?s nursing nipple during breastfeeding Odor- and stain-resistant glass bottle is easy to use, assemble, and clean 4 oz bottle comes with slow-flow nipple that has 3 holes to provide baby's most comfortable feed BPA free and dishwasher safe (top rack)