ButtonMe has a rounded nipple which is very familiar to the baby. the nipple is soft, made with soft silicone which does not expend like natural rubber. it is dainty not too big for the little baby. it is designed with two large vent holes for breathability, and it's curved outward for ventilation. with his classy design and verity of pleasing colors it's the perfect gift for both mommy and baby. also perfect for baby shower, and gift package. available in 2 sizes 0-6 and 6-18 months.