1. It's not *THAT* likely that the ten month old will bring in something...unvaxed does NOT equal dirty and disease-carrying
2. There are new, more virulent strains of things showing up that are affecting vaxed populations as much as unvaxed, so the vax is anon-issue.
3. Don't worry; you'll all be fine. The 2-month old is probably in more danger from all the kids coming in shedding viruses from their vaccines than from the ten month old shedding nothing.