I find it hard to believe that babies wouldn't feel pain before they're born.
Don't most babies want to eat shortly after being born? How is feeling hunger all that different from feeling pain? So they don't need past experience to feel hunger, but they do to feel pain?
I did a Google search, and found these results-
In Aug 2005, researchers at the University of CA found that "The researchers reviewed dozens of studies and medical reports and said the data indicate that fetuses likely are incapable of feeling pain until around the seventh month of pregnancy, when they are about 28 weeks old. "
Another site said "The fetus can feel pain at 20 weeks. This is probably a conservatively late estimate, but it is scientifically solid. Elements of the pain-conveying system (spino-thalamic system) begin to be assembled at 7 weeks; enough development has occurred by 12-14 weeks that some pain perception is likely, and continues to build through the second trimester. By 20 weeks, the spino- thalamic system is fully established and connected. "
Yet another site said that "In the end, the question of fetal pain, like almost all abortion controversy comes down to who you believe. Pro-life doctors state that fetuses can feel pain by 8 weeks after fertilization (about the time most surgical abortions take place). Pro-abortion doctors argue that fetuses don't experience pain until the very end of pregnancy."
And on another-""By 13.5 to 14 weeks, the entire body surface, except for the back and the top of the head, are sensitive to pain." -The Development of the Brain by S. Reinis and J. Goldman "
And on a Pro-Choice site- "In short, the evidence indicates that fetuses do not feel pain until after the start of the third trimesterand even that evidence remains uncertain because it's impossible to know for sure that fetuses consciously experience pain in the same way that a person does. "
This one is from earlier this month- "Premature babies experience real pain rather than just displaying reflex reactions, scientists said yesterday. Brain scans carried out on premature babies during blood tests showed surges of blood and oxygen in the sensory areas of their brains - demonstrating that pain was being processed. Previous research had shown that even the youngest newborns are capable of showing the behavioural signs of pain but it had been unclear whether these were simply bodily reflexes. Prof Maria Fitzgerald, from the department of anatomy and developmental biology at University College London, who led the team, said: "We have shown for the first time that the information about pain reaches the brain in premature babies."
It's interesting what a wide range of conclusions there are! I think it's mostly going to be a matter of opinion, since there isn't really a way to say "Hey, Fetus! How's it going? Could you maybe stop kicking me at 4am? And by the way, do you feel pain if I poke you?"