Will Falconer, DVM Moderator
No one builds immunity by being sheltered from the world, Tracy. The kids who play in the barn behind rows of cows and wrestle in the grass and dirt don't get asthma. It's the ones who grow up with germ killer soap, toothpaste, and wipes.
Here's a page you want to put to work for this youngster right away. Times a wastin', and he's also missing out on good socialization, which you can read about here. That's a short window, so don't wait on that, either.