When they checked your placental bloodflow, did they do dopplers on the flow INTO the placenta? That's where my problems where, I had "notching" in the flow which means it wasn't pulsing correctly.
Pardon me asking (but I don't recall reading elsewhere, sorry if I have!) but were you told why your baby was actually born premature? Because IUGR babies can go full-term. Andrew didn't because the placental bloodflow started "reversing" and he wasn't getting nutrients, so it was a case of getting him out licketysplit.
Do indeed ask your doctor for information, but don't expect to get many answers. IUGR, although documented, is not well researched. Because my hospital is a teaching university-based one, I was lucky to get referred to a Placenta Clinic where they took regular growth scans and where they're using my case as research. One particular feature they noted was that he had a short FL in relation to other measurements (a soft marker for Downs Syndrome), and my consultant said he'd observed that frequently in IUGR babies and none of them came out with Downs.
The two things my consultant can't tell me is why I had the placental bloodflow problem and whether it'll happen again. So we too are in limbo as to whether to have a second baby. I'm not worried so much for the health of the second baby, more bothered by the stress of having a toddler (Andrew) to look after while baby no.2 is in NICU if need be.