Our spout nipples are made of food-grade liquid silicone, safe, BPA-free, lead free, that mimics the action of natural breastfeeding and helps babies transition smoothly from bottle to sippy cup. The pliable texture protects delicate gums while encouraging independent drinking techniques. Sippy Cup Nipples are usually suitable for babies over 6 months of age to exercise their chewing ability. When using a nipple babies usually suck and chew vigorously. This behavior allows babies to gradually get used to the taste and texture of solid food. At the same time, it can also promote the development of the baby's oral muscles, laying a good foundation for language and pronunciation. In addition to exercising chewing ability, the nipple also helps develop your baby's ability to eat on her own.