Mam Anti-Colic bottles have a SkinSoft textured nipple that is accepted by 94 percent of 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 slow-flow nipple. *Market research 2009-2014 of 1,349 babies. Color: Clear. Gender: Unisex.