My daughter is three years old. She has been using KFS since her birth. Its data on the FSC "HEALTHY GENERATION". He uses the rest of the FSCs, choosing the one he wants at a given time. Sometimes my husband and I offer to take the ones she chooses for us. The child is developed beyond his years and thinks like an adult. I highly recommend not being afraid to give them to your children! They are sometimes smarter than adults, that’s for sure in this matter!