Authenticity of a hadith regarding duas being accepted during childbirth/labour

Q: I came across some information a few years ago, which I don't remember the source. I am now pregnant alhamdulilah and I would like to verify this information as I cannot find anything in my Islamic literature.

Is true that dua is accepted during childbirth/labour? If so, please can you provide any basis.

Explanation of how a person who committed suicide will be punished

Q: "Whoever kills himself with a knife will abide in the fire of hell, perpetually stabbing his belly with it, undying therein forever. And whoever hurls himself from a mountain and kills himself shall abide in the fire of hell, perpetually falling to his death, undying therein forever."

I have copied the above from a screenshot from the reliance of the traveler (Shafi’i Fiqh). After resurrection, will any human or jinn die or will they live forever without ever dying? How is this narration understood?