My littlest one (age 4) has always seemed so prone to illness. She catches bugs more often, she gets sicker and weaker, and she stays sicker longer.
I suppose this is just her way, but I'm sure you all have some ideas on how to support her immune system nonetheless. We did just have her tested for allergies -- outdoor mold was the only culprit identified. (Though, as our Dr. says, that just means that it was the only one that had a strong enough reaction to be visible.)
My little peanut is much smaller than the rest of us and much more sensitive in general, emotionally as well as physically. (That is, she is more sensitive to others' feelings and actions -- we're all pretty sensitive about ourselves -- and more expressive.) It makes me worry about her that much more!