for recurrent cold 'Chyavanprash 'is the best immunity boosting medicine. start giving your baby regularly .
there are other remedies like vekhand powder application on chest . dry ginger powder + honey etc but under guidance of doctor and for short term
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you need to build up immunity of your child avoid allergic of dust, smokes, extra cold, For inducing immunity Chyawanprash will help you.There is some antiviral therapy like Syp Septillin in this case
For further imformation visit your nearest ayurvedic doctor