Cutting hair with a kids trimmer

There is no NEED to shave a babies head but I doubt any harm can be done by doing it, although the head is soft it can withstand gentle pressure and im sure they wouldn't be pressing particularly hard on his head with a kids trimmer.But I think if they did ask their HV if it was ok to shave their sons head, all the health visitor would say is there is no need to do so I dont think it would be professional cordless hair clippers any type of rule or guideline doing it. Considering you can have a babies ears pierced in some places at like 3 - 6 months! At the end of the day his hair will grow back and they are his parents never heard of anyone having child taken away for cutting hair .