No offence, but if you think that he will be bullied due to having no thumb nail, thats very very negative to think that way, your little brother will be absolutely fine when he goes to school, granted you get the odd ar$eholes who think there on a higher pedestal by throwing insults, but this has gone on for many many a year, you will have to deal with it {if ever it happens} at that given time, as long as you nip things like this in the butt at an early stage, there will not be a problem