The Thinkbaby All-In-One set starts with a bottle base which transforms into the Sippy and then again into the Thinkster. With adjustable lid types, it follows your baby from newborn to 4+ years of age. Free of BPA, phthalates, nitrosamines, lead, PVC, PET, and biologically harmful chemicals. The All-In-One comes with: two Stage A nipples for 0 to 6 months, two Stage B nipples for 6 to 12 months, two 9oz bottle bases made from polypropylene, two travel tops, two Sippy handles, two Stage C Sippy spouts for 9 to 24 months, and two Stage D Thinkster tops for 18 months and up. The bottle nipples are made from soft, medical-grade silicone, and are cross-cut to mimic natural breastfeeding. This unique design helps reduce gas, spit up, and instances of colic. Travel tops prevent foreign material from coming into contact with the surface of the bottle nipple, and reduces spillage. The Thinkster top swivels for protection as well. Dishwasher safe, top rack recommended, and easy to clean. Perfect for baby showers or registry gifts.