Because children’s bodies are still developing. None of the bones have grown. It is recommended not to put too much burden on her body now. It's good to let her listen to music more and move around more when she has nothing to do. Once your child is older, gradually increase the strength to keep her body flexible. Remember: don’t force your child to do something she doesn’t like. Just be happy! I hope your family will be happy and happy! Happy New Year!