Child should allowes to do what they willing to but under the guide of parents or other adult. You can never force you kid to learn the things he don't like as for he is too young,but you can guide he to build his own interest and tell he to insist.
I find a blog recently that contains many resources such as Chinese kids songs,poems and games.The address is http://www.echineselearning.com/blog/categories/chinese-for-kids
I think it's a good way to help kids learn Chinese in a interesting way.
Hope this will do some help to you