Hi...Thank you for consulting in Health Care magic.
Cough and cold are viral 95% of the times in children. For cold you can use anti-allergics like
cetirizine and for nose block, saline nasal decongestants will do.
For cold and cough you can use
Cetrizine at 0.25mg/kg/dose every 12 hourly for 3 days.
If cough is very severe you can give
Promethazine syrup at 3.5ml twice a day dose for 3 days and see.
For nasal block, plain saline nasal drops will do, every 4-6th hourly to relive
nasal congestion.
Hope my answer was helpful for you. I am happy to help any time. Further clarifications and consultations on Health care magic are welcome. If you do not have any clarifications, you can close the discussion and rate the answer. Wish your kid good health.
Dr. Sumanth MBBS., DCH., DNB (Paed).,