Introducing NUK® Simply Natural bottles are simply the best way to combine breast and bottle, because theyre designed to be closest to moms breast. Continue that special breastfeeding bond, even when you cant breastfeed. 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 moms breast does too. The comfortably familiar nipple feels, works and moves just like moms for a comfortable latch. And the Advanced Anti-Colic Air System makes feeding time more comfortable for everyone. Colours may vary. Multiple nipple holes provide a natural feed, just like moms breast Nipple comes with 3 to 9 holes, depending on flow rate Advanced 1-piece Anti-Colic Air system helps reduce colic, gas and spit up Super soft silicone nipple is the same shape as moms nursing nipple for a familiar fit Flexible nipple moves with baby for a continuous latch