For a lot of reasons, that I won't get into here, I am thinking a lot about the possibility of adoption children, rather then having biological children. Reasons span from personal, to political, to social justice related.
But it is a scary proposition. I know you truly never know what type of child you'll get. What the genetic lottery will put together, but some things, like health during pregnancy you can control. You also know what health problems you and your spouse's family have that are risk factors.
I had a student that was adopted. They could be delightful and thoughtful, clever. They also had attachment disorder, serious emotional issues, fetal alcohol syndrome... I don't know their family, or their situation, but I do know their parents are at their wits end for what to do with the child. Having a kiddo like that scares me. I know that any child can have issues, but seeing children like this one, or other kids at my school, makes me afraid of the challenge I'm opening myself up for by becoming a parent at all, let alone an adoptive parent.
I'm so glad that I have waited to have children, and I think I want to be a mother. But it's also a scary prospect.