I think the operative word here is “born”. Aborted babies are never ‘born’. Hence, by definition, they are not ‘born’ into sin.
Consider Psalm 51:5 Surely I was sinful at birth, sinful from the time my mother conceived me.
Good point. It does get pretty deep when the 1st earth age prior to it's overthrow is considered.
Romans 9:11 "(For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of Him That calleth;"
Romans 9:12 "It was said unto her, "The elder shall serve the younger."
Romans 9:13 "As it is written "Jacob have I loved, but Esau have I hated."