Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Cough and cold in toddler at time of seasonal change is menifastation of allergy. Antibiotics are useful for infectious illneses. They don t work for allergies. Ayurvedic preparation like septilin though manufacturer claims has no proven beneficial role in allergies. Best way for prevention will be minimize exposure to cold and dust, insects and pets, and grass and pollens. If chest is congested and wheezing is present show to pediatrician the medicine can be given after thorough history and physical examination. Hope I have answered your query. Let me know if I can assist you further.