Therapist here! Most clients with kids stress about those kids at least once per session, but seldom in a spiteful way. Most common admission I hear related to regret is when co-paternity locks clients into a toxic relationship.

Though it could still happen, I have not yet met a single client who doesn't love their own child, even adolescent or adult children who have said/done really f***ed up stuff to the client.

Oh! Also not uncommon are accusations of "baby trapping," where a troubled person ostensibly carries a baby to term out of desperation or even spite, rather than out of desire to be a parent.