there's always the risk of infection when you leave splinters...
something that's worked for us is to cut pieces of banana peel and taped/bandaided them to the splinter. leave them overnight and the next day the splinter is either gone, or pulled out enough that you can get to it. ofcourse, with your son being 10 months old and the splinters being on his feet, i'm not sure how practical that would be... unless he will keep socks on...
that being said, the bread trick sounds less complicated... we're definitely going to try that one next time!!!