In Jewish law, although the human soul exists before birth, human life begins at birth, that is, at the time when the child is more than halfway emerged from the mother’s body. Judaism completely rejects the notion of original sin. According to Judaism, a child is born pure, completely free from sin. We pray daily “God, the soul which you gave me is pure. You created it, you fashioned it, you breathed it into me.”
Birth by Caesarean section is permitted in Jewish law, as would be just about any procedure necessary to preserve the life of the mother or the child.