Cough Alarms My Three Month Old Has A Dry Cough Sometimes. Allergies?

My three month old has a dry cough sometimes. Allergies? - cough alarms

The doctor said it could be allergies, but his lungs were clear. I was wondering whether someone is a problem with your child. It is in the house. We have no pets at home, and none of us smoke, so I was not sure if there is something to be worried. My mother had asthma and I really hope you do not develop. She has no fever or anything, but only a dry cough, sometimes after eating. It has not even a cold that you have allergies.