My baby is five months old weighing 9 kgs.formula fed From last three months,he has congestion in back side of nose. Everything like microscopic dust particles and even small temperature drop at night causes his nose blockage, He seems very uncomfortable with watery eyes,stuffy nose n sometimes difficulty in feeding also. Used saline n nasivion also but gives short term relief.trying steam which relieves him for 3to 4 hours. Tried cetrizine drops for few days but again happens after stopping it. He has no cold or fever or chest congestion or any other problem.please help doctor.