Please expect slight more for the first child, like mentioned in post above many one off stuff to buy.

By the age of 1 should start to settle down, I would say including baby sitter roughly 1.5k-2.5k will do per month.

Some of the month prone to have unexpected stuff, like baby sick la, toys, add clothing etc.

Standard recurring stuff like diapers, milk, food I would say prob 500 may be able to cover.