WebMD recommends cleaning an infant's nasal passages with saline drops and a bulb syringe to relieve sinus congestion. A vaporizer or humidifier also helps. Gentle pats on the back and sitting in a steamy bathroom help with chest congestion.
WebMD warns that children under four years old should never be given cough or cold medicine. If coughing is bothersome, WebMD recommends small amounts of warmed clear fluids, such as apple juice or water, to thin mucous. Simple measures like extra fluids, plenty of rest and extra affection makes an infant's cold more endurable. Raising the infant's head at bedtime eases breathing and allows for restful sleep.