I will not give 保嬰單 to infant. The nurses at the child health center told me not to give 保嬰單, rice water and other Chinese herbs, etc. to infants. They said that the liver of the infant cannot take them yet.
I only give 'fat boy water' to my children when they cry and do not sleep well. So far so good, and my eldest daughter is almost 2 years old now.
Mothers from baby kingdom once posted that the book and nurses said 1kg consumes 6 oz, so if your baby weighs 5kg, she will then need to consume 30 oz per day. For instance, 5 oz per feeding and 6 feedings per day.
You may find 肥仔水 at the drug stores. I know this kind of 'drink' from my mother. It's my mom who told me 俾bb食肥仔水 when I had my first newborn. Cos my first child also had the common problems such as cried in the middle of the night, did not sleep well, woke up when put her in bed, etc.
It's called 肥仔水 but it doesn't mean that it will make baby gets fat. It got this nickname because it's package design used a fat baby boy as the 'mug head'. I do not know the ingredients of the drink by heart, they should be clearly stated in the bottle cover. The drink is to cure the colic and tummy pain of the baby.
In addition, this drink can be given to newborn baby. For instance, 0-1 month old babies take half teaspoon per feeding. The feeding instruction is also clearly stated on the package. Read them before you buy it or use it.