Multiple nipple holes provide a natural feed, just like mom's breast. Nipple comes with 3 to 9 holes, depending on flow rate. 5 oz bottle comes with slow flow nipple that has 3 holes. Advanced 1-piece Anti-Colic Air system helps reduce colic, gas and spit up Super soft silicone nipple is the same shape as mom's nursing nipple for a familiar fit. Flexible nipple moves with baby for a continuous latch Recommended by 90% of Moms - based on a July 2015 home use test. Mom's agree that they provided their babies with natural, close-to-mom comfort. Odor & stain resistant crystal clear Titan bottle is BPA Free & assembled in USA. Continue that special breastfeeding bond, even when you can't breastfeed. Introducing NUK Simply Natural bottles are simply the best way to combine breast and bottle, because they're designed to be closest to mom's breast. So now, baby has a close-to-mom feel never before found from a bottle. Unlike most bottles, they have multiple nipple holes (up to 9) because mom's breast does too. The comfortably familiar nipple feels, works and moves just like mom's for a comfortable latch. And the Advanced Anti-Colic Air System makes feeding time more comfortable for everyone. Make the transition between breast and bottle as natural as ever. So that no matter how feedings happen, you can always share that special connection with baby. NUK Simply Natural 5 oz bottles are BPA Free and come with a slow flow nipple with 3 nipple holes. The Triton bottles are odor & stain resistant and are easy to use, clean, and assemble and are dishwasher safe. When feeding your baby, the vent should be under baby's nose with nipple holes on top. NUK Simply Natural Bottle, 5-Ounce Continue that special breastfeeding bond, even when you can’t breastfeed. NUK Simply Natural bottles are simply the best way to combine breast and bottle, because they’re designed to be closest to mom’s breast. So now, baby has a close-to-mom feel never before found from a bottle. Unlike most bottles, they have multiple nipple holes (up to 9) because mom’s breast does too. The comfortably familiar nipple feels, works and moves just like mom’s for a comfortable latch. And the Advanced Anti-Colic Air System makes feeding time more comfortable for everyone. So that no matter how feedings happen, you can always share that special connection with baby. Bottles that won’t break the bond NUK Simply Natural Bottles are designed to be closest to mom’s breast. Now, baby has a close-to-mom feel never before found from a bottle!