hi my son is 23 months old and he is coughing since 2 months initially night time he used to get cough after 2 weeks it wsa shifted to day time..when he jumps and running we went to doctor he tested every thing and he said lungs are free and he gave inhaler pulmicort before bed time but i dont find any results and we tested allergy test milk allergy got mild but doctor said there is no milk allergy..but he is coughing still..can any one suggest me..