I have an adopted daughter.
Because "private" adoption agencies house, feed, cloth, and provide medical services to the birth mother during gestation, in order to help protect the fetus from an irresponsible birth mother,I would say that is in effect, selling her fetus.
If she's too irresponsible to have a baby, then giving up her baby is the responsible thing to do. Did she get money for it? If she didn't then she didn't sell it.