Ade,
Would be better to avoid pears, tomatos, potatos, citrus fruits, banana yes, biscuits yes.
Southern and Northern Almonds are perfect for coughs, buy them from the chinese medical hall, take a teaspoon of each, boil with 3 bowls water, use as water for your boy's milk.
Alternatively, blend both almonds (teaspoon each) with 2 bowls of water, use a muslin cloth to drain off the almond bits leaving the clear almond milk, add in bird's nest and use a ceramic pot to double boil for 2 hrs, great as dessert.