For female, indicate
19. Number of children born alive ___

20. Number of children still alive ___

Question 25 (A and B) is answered by women age 15 and older, regardless of their marital status.

Column 25B

How many of them are alive?

From the total number of the children, born by the women the number of the alive children is written in the column corresponding to the question 25B.
If at the time of the census none of her children are alive then 0 is written.
If "0" is written in the column 25A, then "0" should be written in column 25B without any additional questioning.