Stage 1: 0-6 months, slower flow. Designed for breastfeeding babies. The Johnson's Healthflow silicone nipple is designed to make feeding easy for your baby. The nipple has a rounded tip to help your baby latch on, and its base conforms to baby's mouth to help seal out air. The nipple is made from silicone, the softest material available, to respond to your baby's sucking action. The Johnson's Healthflow Stage 1 nipple is specially designed for younger babies. It has a smaller opening to help prevent your infant from receiving too much liquid. Also available in Stage 2, with a faster flow for older babies.