How much crickets should i feed my bearded dragon?

he's about 6 months old and my parents want me to feed him around 10 crickets a day, but when i do that my bearded dragon eats them faster the next day. now i feed him about 15-20 and he gets fat, how much should i feed him? and i feed him crickets in morning and veggies such as carrots and kale or collard in the afternoon.