Hi I.,
Your pediatrician is right that there is not much else you can do but there is a way to prevent future colds. The best solution to any illness is to build the immune system.
There are numerous household items that break down the immune system. Cleaning products, bath and body products, laundry detergents and especially chlorine bleach, are terribly damaging to the immune system. They break down the immune system, the neurological system and the respiratory system.
Lysol has Agent Orange in it, chlorine bleach was invented by our military to kill people, Pledge and Windex do neurological damage. Johnson and Johnson baby shampoo (along with most J and J products) and even Gerber's Grins and Giggles has Quaternium-15 in them which is a known cancer causing agent. Q-15 is a cheap preservative that releases formaldehyde.
Detoxing your home is simple and can be very inexpensive. I wish I had known this when I was a young mother. My kids don't get sick anymore. My 15 year old will even babysit sick children because she know she won't get sick. If you're interested in specific inofrmation, let me know. I'd be glad to help!
Regards,
M.