my preemie was detected with pneumonia last month and was cured with medicine after that he had no problem now again he is getting cough some tomes sneezes only 2-6 times a day but has no whopping cough . I have checked his poo since last 3 days its green and today also I saw mucus. do we need to consult doctor . doctor advised to give maxtra drops at home when Sardi is there .since whooping cough is not there we haven't consulted doctor but mucus on stool is OK or we would go to doctor ? please advice experts . since my baby was born premature he is having cough issues with very change of weather. his age is 5 months corrected , seven months actual.