Not a duplicate of What is Hinduism's view on abortion?, because it is on abortion in general.
In the linked question a lot of the answers saying abortion is immoral/sinful simply do not make sense to be immoral/sinful for someone outside the Chatur Varna e.g. an outcast can't become an outcast again, "those born in consequence of an illegal mixture of the castes," don't get the libations of water anyway, someone outside the Chatur Varna cannot lose caste, etc. Others have to be in brief otherwise they would lead to nonsense conclusions like Rama went to Hell for hunting deer.
Ironically the scripture that seems to be the harshest critic of abortion has the most glaring issue with abortion being sinful outside the Chatur Varna. The Parashara Smriti says this which seems to be straightforward anti-abortion:
What sin is incurred in killing a Brahman, abortion causes a sin twice as great ; there is no atonement for that sin. The abandonment of such a woman has been ordained by law.
The Parashara Smriti says a similar thing for cows that killing a fully formed cow fetus twice as bad as killing a cow. This shows the Parashara Smriti really considers killing a fully formed fetus twice as bad as killing the born version of that thing. That has to leave out people outside the Chatur Varna, because there is no sin mentioned in Hinduism for killing someone outside the Chatur Varna (anymore than the life you kill on a daily basis). That's honestly for the best, because of cancer.
If all the members of the foetus are complete, or if it be observed to have consciousness, or fully developed in its limbs, large and small — then the sinner must perform twice the penance for killing a cow.
Does anyone have a scripture saying against abortion of a child outside the Chatur Varna, that is clearly not in brief due to nonsense conclusions?