What should I do if my two-month-old baby has a stuffy nose? Among the various cold symptoms that babies experience in life, nasal congestion is one of the more common ones. If the baby\’s nasal congestion is not treated in time and does not improve for a long time, it will affect the baby\’s breathing and sleep. So, what should you do when your two-month-old baby has a stuffy nose? We can start from the following aspects: Option 1: Dietary conditioning The baby’s diet is also helpful in treating nasal congestion.