A: Not all trans people want biological children. (Not all cis people want biological children either.) Some are happy to adopt; some don’t want children at all.
Some trans people already have biological children by the time they transition.
And it’s possible to have biological children after transition. Some people transition without hormones or surgery. It’s possible to freeze eggs and sperm before beginning a transition. Trans men, and other trans people who were assigned female at birth, have been known to give birth and even nurse their babies.
A Trans 101 Blog 