Thanks for putting up your query at HealthCareMagic. Your little kid is suffering from common cold. In most of the cases this is due to a viral cause rather than bacterial. In case of viral infections antibiotics are ineffective and hence may provide no relief as in your case. But when you have started antibiotics, it is preferrable to continue them for the prescribed 5 days to avoid development of antibiotic resistance. You need not go to a new doctor. Rather give the baby steam inhalation. Sit with the baby in your lap and put the source of steam before you. The air that the baby breathes in would automatically contain steam and the baby will breathe that in. The water vapour or steam will help in diluting the cough and provide relief. In a hospital setup, nebulisation could be given instead. What you eat affects the quality of milk that you produce. Thus what you eat is what goes to the baby. Although in Ayurvedic medicine it is suggested not to take mangoes during cold, no evidence in favour of it has been demonstrated and there is no justification for the same as per modern medicine. So I would not stop you from taking mangoes. I hope that helps. Feel free to revert back with further queries if any.