One way:

"The recommendations when using liquid cow or goat milk in infants less than 6 months old and for each feed are the following:

* For the one-month-old mix 40 ml of milk with 20 ml of boiled water and add 4 g of sugar

* For a two-months old mix 60 ml of milk with 30 ml of boiled water and add 6g of sugar

* for infants 3-4 months old mix 80 ml of milk with 40 ml of boiled water and add 8g of sugar

* For infants 5-6 months old mix 100 ml of milk with 50 ml of boiled water and add 10g of sugar