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A baby that is SGA is a baby whose weight is below the 10th percentile for gestational age (by dates, and/or by assessment). SGA babies can be term, preterm, or postterm.
IUGR babies are ones who haven't grown in utero at the rate they'd be expected to. A lot of IUGR babies are SGA, but not all.
IUGR can be symmetrical -- or maybe a better way to put it would be that ALL of their measurements (height, weight, and head circumference) are less than what you'd expect for that particular gestation. Or it can be asymmetrical -- say, two of the three measurements are normal, but the third is less than expected. Say their HC and length are normal, but the weight is low. Those babies look really wasted and malnourished, and a lot look like their heads are too big for their bodies.
This is a really short answer; this post could go on and on, and maybe there's someone who knows a better way to explain it than this. But either way, I hope it helps.
Also, www.neonatology.com has a whole index of conditions. You might want to check it out to see what an IUGR baby looks like, vs. an SGA one. Might be there.
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