My son is 4 months old and has been experiencing chest congestion during/after a crying episode. He doesn t seem to be in respiratory distress. It has been going on for several weeks and he has seen his Peditrician in regards to this. She has not witnessed an episode but she noted he is afebrile, has clear breath sounds, does not have a cough, has doubled his birthweight , and his activity level remains unchanged. She is not sure what it is not concerned but has offered to refer him to a Pulmonologist if I would like. He does have some nasal congestion for which I use saline . Is this normal for some infants or should it be investigated further?