Hello there, . The common cold is a viral infection of your upper respiratory tract — your nose and throat. A common cold is usually harmless, although it may not feel that way at the time.. Preschool children are at greatest risk of frequent colds.. Use saline nasal drops. To help relieve nasal congestion, try saline nasal drops. You can buy these drops over-the-counter, and they're effective, safe and nonirritating, even for children....Consult Pediatrician for any medications...