MAM Easy Active Bottles have a SkinSoft textured nipple that is easily accepted by babies. The anti-slip surface at the base helps to keep it in baby's mouth, so MAM nipples are often accepted by babies when other nipples are not.The flat shape of the nipple fits perfectly in your baby's mouth, making the switch between breast and bottle easy. The ergonomically-designed bottle is easy for both parents and babies to hold, and the wide neck makes filling and cleaning easy. The bottles are also compatible with Slow Flow (0+ months), Medium Flow (2+ months), Fast Flow (4+ months), and Extra Fast Flow (6+ months) nipples. This set includes two MAM Fast Flow Silicone Nipples, accepted by 94% of babies. The bottle is made from BPS and BPA free materials.