Most congestion is temporary. If your baby doesn’t seem to be getting better, has been unwell for longer than 2 weeks or you notice any of the following warning signs, call your doctor:
any fever in an infant under 3 months
a fever of 102°F or higher in older babies and children
any trouble breathing or feeding difficulties
blue tinges to skin, lips or nails
green, black or pink mucus, or yellow, if lasting more than a few days