Kids do get sick a lot and some kids more than others. If you are concerned, when your son is well, have the doc run a complete blood work up on him. In the meantime there are some things you can do to boost his immune system.
Viral illnesses such as colds and flu may be helped by taking Sambucol. The site is www.sambucol.com Read the label for doses - there is the well, preventive dose and the intensive, already sick dose. He should take it for 6 weeks and then take 2 weeks off before resuming again. This seems to be helping my toddler. It will not help bacterial infections. And you should ask the doc before giving it to him just to be safe.
Toddlers are known to be picky eaters. Does he take a multi-vitamin? Animal Parade is a great vit for kids and tastes good too. Mine love it. Here's a link http://www.evitamins.com/product.asp?pid=295
I would also give him a little extra vit C everyday for the allergies and frequent illnesses. Animal Parade also makes a good, tasty vit C. If he's taking the multi-vit with breakfast then I would give the vit C after lunch or afternoon snack. He only needs to take one of these if he's well and two if he's sick.
You may also consider working with a nutritionist to rule out allergies to foods that may be causing cold-like symptoms. He could do a rotation diet and the nutritionist can help him have a healthier diet as well.
I hope he feels better.
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