[quote=Zeropathic]
how many giants are there? And what happens to the ladies giving birth to them? Somehow, it doesn't sound so healthy for the mother.
[/quote]

In Sodom and Gomorrah, right now? Alive, very few. Dead, many. Mysteriously disappeared, even more. A giant is born much in the same way a human does, since the fetus is similar in size to a normal one; however, many mothers either die in childbirth, or kill themselves upon seeing the abomination their womb has spawned.