Couldn't Niniel and Turin work this out?

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Originally Posted by Eorl of Rohan

Niniel was pregnant when she committed suicide; that's technically an infanticide.

Words sometimes have specific meanings. Like patricide means 'killing Patrick.'

Originally Posted by obloquy

Suicide is sinful because all deliberately self-destructive practices are sinful. A righteous man recognizes his life and health as gifts from God, which he would never willfully spurn.

I was thinking about this. Those who stood beside Húrin, providing a rear guard so that Turgon could escape, knew that they were about to die. Standing, their task was to slow the advance of Morgoth's hordes. Sense would dictate that they flee, but they didn't. Not only had they made oaths to their King, but some may have known that they were sacrificing themselves so that there would still be a tomorrow, and one day, Morgoth's realm would fall.

Niniel, knowing now that her child was Turin's, may have believed that her child, being in the line of Hurin (not half, but from both sides), would allow Morgoth to continue his tortuous game with the next generation of this sorrowful family. In her despair, but also, like her family, in defiance of Morgoth, she sacrificed herself and the life of her child to thwart the Dark Lord's plans.

Who knows what life this child would have had? Thralldom? A Dark Child under Morgoth, used as a weapon against the Free Elves and Men?

Does this sanction suicide or homicide? Not in the least. This was a special person in special circumstances.

Didn't see anything proscribing suicide in Arda. Tolkien, being a Christian in our world, had other beliefs outside his created world. And it is believed that his God is a god of love and grace, which all surely need, even those like Niniel.