Allah causes you to be infertile (not able to have children) or fertile (able to have children)

Allah causes you to be infertile (not able to have children) or fertile (able to have children)

"To Allaah belongs the kingdom of the heavens and the earth. He creates what He wills. He bestows female (offspring) upon whom He wills, and bestows male (offspring) upon whom He wills. Or He bestows both males and females and He renders barren whomever He wills. Verily, He is the all-Knower and is Able to do all things." [Quran 42:49-50]

"He bestows female upon whom He wills."

means, He gives them daughters only.

Al-Baghawi said: "And among them (those who were given
daughters only) was Lut, peace be upon him."

"and bestows male upon whom He wills."

means, He gives them sons only.

Al-Baghawi said: "Like Ibrahim Al-Khalil, peace be upon him, who
did not have any daughters."

"Or He bestows both males and females"

means, He gives to whomsoever He wills both males and
females, sons and daughters.

Al-Baghawi said: "Like Muhammad."

"and He renders barren whom He wills."

means, so that he has no children at all.

Al-Baghawi said: "Like Yahya and Isa, peace be upon them."

So people are divided into four categories: some are
given daughters, some are given sons, some are given
both sons and daughters, and some are not given either
sons or daughters, but they are rendered barren, with no
offspring.