Features: -Replacement nipple set is specially designed for Comotomo bottles -Each set includes 2 silicone nipples designed to mimic breastfeeding and avoid confusion -Soft silicone nipples have a natural shape and are perfect for babies who are struggling to switch from bottle feeding -Each replacement nipple features two innovative openings that help prevent colic , while eliminating leaks -Comotomo's replacement pacifiers will fit baby throughout their growth -Easy to clean -Microwave safe in boiling water , in the dishwasher or in a sterilizer -100% medical grade silicone -Medium flow (2 holes) for babies aged 3 to 6 months