Here's an article for all you medically-minded folk. It's over my head, and I'm a halfway intelligent person with an honorary MD (I gave it to myself, so there), so here's the gist of it: preemies who experience a lot of invasive procedures (i.e. needle sticks, intubation, injections, IV placement, etc.) experience a lot of pain (duh), which both desensitizes them to pain AND to pain medications. This would explain why Becca didn't even cry when she got her H1N1 shot last week. Not a bit. The whole not feeling pain thing is nice, in a way, but remember that pain is actually your body warning you to take action - as in, when you stick your hand in the boiling water, you feel pain so that you will remove your hand before tissue damage sets in. Anyhow, I found it interesting - the parts that I could understand, at least!
Hmmm...I don't seem to be able to get the text to paste. Here's the link, at least: click me!