It's not just having a child that's genetically related to you. It's also raising a child from birth. Most parents want to come home with a baby, and have the experiences of having a baby - seeing the first smile, first steps, feeding them, diapering them, kissing their little baby toes. There are very few newborn babies available for adoption. Most children available for adoption in the US are older children. Even in international adoption, they're usually not babies, and more and more countries are shutting down international adoption.

I'm adopted, and I think adoption is great. But those parents are giving up a lot, when they wanted a baby, and got a 13 year old.