Hi all - do check in from time to time, but by the time I've read everything there's no time to actually post anything myself...
EmLou - I've no direct experience of IUGR (my first, unfortunately for my lady parts, was the size of a small elephant...) other than a close friend of mine's brother, who was an IUGR baby, and is now a strapping 6ft 4" hulk who rigs sound and lighting at stadium rock concerts for a living... Funnily enough, I found out about this when they said that my baby was measuring 'small for dates' at my 20 week scan and I freaked out all over the place, as we mums-to-be are wont to do... She ended up being 9lbs 8oz, so clearly they don;t always get things 100% right...
I think it's worth keeping in mind that there is actually nothing wrong with your baby, per se, other than that, for a variety of reasons he/she may not be getting quite enough stuff through your placenta. Worst case, he/she may have a bit of a harder time of things early on, because of either being born early, or small, but they'll make up the ground really fast, from what I've heard (and as my friend's brother more than confirms...).
It appears that no-one is pressing alarm bells yet, which is good... and while you baby is on the lower end of the chart, he/she is still ON the chart... and like you said, your first was small, so it might just be the way you make 'em...
What I'm saying is, please try not to worry... I know from experience how almost impossible that is, but keep telling yourself that there is nothing wrong with your baby - he/she is small, but perfectly formed, and they're keeping a good eye on you - which is good.
Meanwhile, take extra special care of yourself, all the worry takes it out of a person, eat well, rest plenty, get as much sleep as you can.
And keep in touch here - it's a very good place just to vent/let rip or give voice to your darkest anxieties without fear of being made to feel foolish...
Having blathered on, I'm sure there are lots of people with more useful things to say, but I wanted to just respond having been through some similar things (not the smallness, but suspected genetic anomaly which turned out not to be...) and, well, just feeling your pain, a bit.
HUGS
db
xx