babysitter for RH?

FH has a son and we wanted to get him his own 'babysitter' (just someone to watch over him during the ceremony and Reception because FH won't really be able to attend to him -- you know, cut up his food and take him to the bathroom and stuff) - any suggestions? This person will also be attending the ceremony and Reception because of course the son will need to be there for everything!

We don't need a babysitter for anyone else, because the rest of the kids coming are 10+ and don't need constant supervision.