Ps 58:3 The wicked are estranged from the womb: they go astray as soon as they be born, speaking lies.
Obviously these wicked people are the non-elect babies that God is going to send to Hell for his glory. Eventually they would grow up to be wicked people. Nothing in this verse about elect babies.
You can't possibly be serious? David claims that he too was born in sin and he was not blaming his mother for any type of fornication, but taking responsibility for his own sin - Psa. 51.