If your baby has been congested for 2 weeks, it would be advisable to consult a doctor. Saline solution and hydration are the most effective ways to relieve congestion in children. If the congestion lasts longer than 10 days, it could be a sign of an infection other than a viral one, and it would be important for the doctor to determine the exact cause. Feel free to reach out if you have any other questions or concerns.