My baby boy is now 15 weeks and still has this cough. He had an upper resp. infection when we brought him home. He was put on an antibiotic then later switched because he got worse and got walking pnemonia. After switching him to a different antibiotic he is getting better however he still has this yucky nasty cough with the gagging afterwards. Help!! We have been to the vet 5 times in the short time we have had him.