Thanks for the query
Actually all the drugs which he has prescribed for your baby is uncommon prescription for this age. As treatment suggests and as also your doc told about the progress of severity of condition, he must be treating your baby as a case of whooping cough
. As immunity against whooping cough does not come from mother it can happen in this age but very uncommon. You can give nasoclear drop 1 drop in each nostril
alternatively at an interval of about 5 minutes 5-6 times a day, particularly before feeds.
I would suggest you to continue with the same medication, timely immunisation and to be careful for the worsening of condition if any.
I hope this answers your query well
Wish you and your family good health