i've never had an enormous baby, although my last is taller than the others and he grows out of clothes and shoes faster than they did.
what i would say is don't set too much store by the percentiles on growth charts. my first daughter was nearly off the bottom (under the 10th line) and my second daughter was near the top (over the 75th line) - they are now 19 and 16 and THE SAME HEIGHT!!!!! - about 5'7".
my mother was 6' (and so am i, and my brothers are 6'6") and my mil is 5'. also my father's mother was under 5'. so we have a mixed bag of genes but you just can't tell what will predominate...