I doubt very much that this is a case of sinusitis. I suggest that you see a good pediatrician to clarify this diagnosis. Usually, colds may be accompanied by fever, but that does not automatically mean that there is infection, let alone, sinusitis. You should get him tested for white cell counts and other evidence of infection before coming to such a conclusion; also, sinusitis can often be studied after X-rays of the sinuses are done. Has your doctor ever asked you to do these X-rays? Feel free to return for a follow-up. -Dr. Taher Kagalwala.