Coughing

Hi ladies my baby girl has been starting to cough after she eats, im thinking its acid reflux i did take her to the dr for the cough thinking it was a cold and in her lungs and i just wanted to make sure it wasnt. The dr said everything looked good , ears nose and throat were all clear as well as her lungs. I have noticed it happens more after she eats but doesnt seem to have any other symtoms. Any adivce and best enfamile formula to try ? Has this happened to anyone else? Shes just over a month old and has been on similac pro advance.