Fertility
Only for women who have had children
[Questions 27 and 28 are asked of women who had have children]

28. At what age did you give birth to your first child born alive?

Fertility

Questions about fertility should be asked exclusively of the women who have had children, independent of their civil status (married or not, etc.)

Since these questions are considered a bit delicate due to their nature, it is recommended that it be left for last, which means when the form has been completed for all of the members of the census household in the rest of the questions. For men and women who have not had children, you should write a large X across the boxes that correspond to questions 27 and 28.

Question 28: At what age did you have your first child?

Here she should inform the mother' age at the date of giving birth to her first child born alive.

When giving the age at which the woman delivered her first child, you should compare the age of the oldest child, which is on the form, with the current age of the mother, to deduce if the information is compatible. For example, if a woman says that she is 40 years old and her first child was born when she was 20, and the form says that her oldest child is 25 years old, it seems that there is an error in the data, because if you add up the age at which she had her first child (20 years) and the age of the oldest child (25 years), you get 45 years, and the woman said that she is 40 years old.

[p. 53]

It is possible that the information that you obtain is not always complete, but you will try that it is, without by this meaning that you should create uncomfortable situations. It is probable that some single women who were in this situation, due to social prejudice, would not want to inform about aspects referring to fertility in general.