It depends on how old your child is. After the child can walk, he can play a bicycle with pedals sitting on the ground for TA, without auxiliary wheels. Let children learn to balance, slide, turn, slow down and stop slowly. When children grow taller, they will naturally switch to children's bicycles (no auxiliary wheels are needed, but it depends on the needs). Children's bicycles are generally not too heavy, but it is not recommended to use too much plastic.