Free of - Bisphenol-A (BPA), phthalates, nitrosamines, lead, PVC, PET, and biologically harmful chemicals. No spill nipple - features our cross cut design. The design also mimics natural breastfeeding as it requires your little one to nurse to receive fluid. Anti-colic nipple helps reduce incidence of gas and spit up. Unique one-piece design eliminates cleaning headaches and tricky assembly. No extra parts to lose. Extra soft, medical grade silicone - provides easier transition from breastfeeding to bottle feeding. Comes with Stage B nipple (for 6 - 12 months and marked with a number 3 on the nipple).