im not sure, but its probably best not to get a child used to what a adult person isn't allowed to do, despite the fact that they are not yet held responsible.
Asalaamu Alaikum Wr Wb, jazakallahu khayran for your question. According to Sheikh Hamza Karamali:
It is offensive to shave part of the hair of the head and to leave other parts of it unshaved. This is called qaza` in Arabic. "Shaving" refers to the complete removal of hair using a razor or something similar. Merely shortening the hair at certain locations and not shortening it at other locations does not fall under the definition of qaza` and is neither offensive nor unlawful in and of itself.
Although cutting one's hair in such a manner isn't forbidden in and of itself, it may become unlawful for external reasons that return to one's intention. For example, if one's is styling one's hair in a certain manner is to imitate someone who is not fit to be imitated--such as film and music stars that are known for their immoral conduct--the haircut would become impermissible because of this external factor. If, however, one is styling one's hair in a particular manner merely because one likes the way it looks, then there is nothing wrong with it.
