It's a good question, Neesy, and ethically it's a huge issue. If your idea of 'quality of life' is being able to live as close to an average life as possible, many times it's not in the child's best interest to intervene in extremely premature births. If 'quality of life' means being alive at all, extreme intervention is warranted. I tend to fall on that side of the fence, because you just never know what will happen. My uncle was born more than two months premature, in the late 50s. He weighed less than a pound and would fit in the palm of Grandpa's hand. The doctors said he didn't have a chance--he would likely die, and if he didn't, he would have terrible physical and mental issues. They would have let him die, but my grandpa and grandma were fierce in his defense. They took him home, caed for him night and day, and he's perfectly normal--the biggest of their three boys, in fact. If he'd been handicapped, maybe I would feel differently. I don't know.
Long, complicated answer, I know, but it's a complicated question.
Do you believe in life at any cost?