Swarnaprashana drops for kids is excellent to prevent frequent infections. This is administered once in a month on pushya nakshatra. Also start giving swamala leha daily quarter tsp for improving immunity along with septilin syrup 5ml twice for 3 months. Give dry fruits like almonds, walnuts, anjeer, dates. Give an egg every alternate day. Also fresh vegetables. You can give milk by boiling it with a pinch of turmeric and  a pinch of pepper powder every day in the evening to improve immunity

No need to give Brahma Rasayan... There are many other options available. First of all you need to bring some change in his diet. Avoid all all kinds of processed foods like chips, noodles etc. Include more of fruits and raw vegetables in his diet.

Avoid self medication. Watch your babies diet. Give rajanyadi churna 1/2 tsp with honey daily after food.

Please do not give brham rasayan in winters. If your kid is of 4 year and have cough cold then give him/her Honey+ ginger + black papper Two times in a day Second give him/her turmeric milk at night before sleep ( warm)

Consult ayurveda physician for proper diagnosis and root cause of ailment

U can give plain brahmi....

Hello Ma'am,no need to give in winter season, you can give 1/2 tsf once a day  during summer and rainy season

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If appetite is good can give in low doses like 2.5g. If appetite is low give rajanyadi curna 2 pinches with ghee twice before food for a week and then use rasayana like kooshmanda rasayana in small doses.