The SkinSoft textured nipple feels natural to babies making the switch between breast and bottle easy; nippleu0026#39;s flat shape fits perfectly in the babyu0026#39;s mouthnIncludes two 9oz Anti-Colic Bottle with two Medium Flow NipplenPatented vented base regulates pressure ensuring babies do not get air in their tummy while feedingnWide openings make it easy to clean, fill and assemblenSelf-sterilizes in 3 minutes in the microwave in 3 easy stepsnMAM Anti-Colic bottles have a SkinSoft textured nipple that is easily accepted by babies and a patented vented base that regulates pressure ensuring babies do not get air in their tummy while feeding. The wide openings make it easy to clean, fill and assemble. The bottle self-sterilizes in 3 minutes in the microwave in 3 easy steps for easy cleaning. Includes 1 medium-flow nipple.