Jennifer, not sure if you've found a team yet or not. I saw there was a reply already to your post and I know you posted a while back. However, if you are still looking for a team and you think your son could play up a year on a 10U team, I'd appreciate the opportunity to talk with you more about what we offer and schedule a try out.
I coach a 10U team called the Revolution that plays out of Affton and made a post recently in the Teams looking for Players section. You can reach me at 314-255-3167 or firstname.lastname@example.org.