Don't add too much peppercorns, fresh ginger and cloves as it may cause a burning sensation in the gut.
Drink kadha either first thing in the morning or before going to bed. If cold symptoms are severe you can have it thrice a day.
Don't force toddlers to drink a whole mug, a quarter cup or half is enough.
Giving it to babies, about 1-2 tbsp every day is good for their overall health. Don't add honey for babies under 1 year old.