thinkbaby introduces Stage A and Stage B nipples. With our new design we are able to reduce the number of nipples variations that parents need to purchase. This not only saves money, but also reduces the challenge of identifying which flow rate works best. We recommend Stage A nipples for 0 to 6 months and Stage B for 6 to 12 months. How is the thinkbaby bottle different? Simply creating a baby bottle that was safe just wasnt enough. We went the extra mile to create a bottle that solved many parental complaints. For example, most bottles on the market contain venting systems. Our system is built right into the nipple. So there are no extra pieces to clean or potentially lose. We then made the nipple No Spill through our cross cut design. This eliminated a large amount of mess that occurs during feeding. It also mimics the way children feed during breastfeeding, as it requires them to apply pressure and nurse to receive fluid.