Bronchiolitis Cough, 3.5 months old

My baby was coughing badly at night but not during the day. I was concerned that this cough had lingered for about a month and a half, and this is the second time I took him to the doctor. When the nurse left the examination room, he started coughing and I caught it on video to show the doctor. It was determined not to be caused by RSV or Pertussis (Whooping Cough).