D.M.
My son had frequent congestion, and the OTC stuff was pulled right after my son was born...so, we have had to use the tried and true old school methods.
* Humidifier
* Infants Vics Vapor Rub (all day)
* Steamy Shower
* Walks at night when it's cooler and more moisture in the air
Those things helped us get through the worst of it...Good luck. If it's not gone in about five days, I'd call your doc and ask the nurse what to recommend. Save yourself a trip and give them a ring, I call my doctor's office all the time with questions...sometimes I even save myself a trip if I can get them to give me the same advice over the phone.