Many couples struggle with fertility in their lives. Trying to have kids can be a truly stressful experience when you cannot. It can put a lot of things into perspective for couples. Some couples choose to still create a family by adopting a child. Many families welcome a child into their world and love that child as though they had given birth to the child themselves.
However, some people feel as though that child is not their "true" child, because they are not biologically theirs.