I haven't read the whole thread, but, here are my 3.
Ds1 - born 9lb12, 98th centile, shot down to 50th by 2 weeks old, slipped down to 9th centile, currently somewhere just above the 25th for weight, just under 50th for height. He is 6.6 and weighs 3stone3. (and is very skinny!) He was induced labour, born naturally, although I had an epidural. 2nd degree tear with him which was stitched (ow).
Dd - born 10lb0, 99.8th centile, she went down to the 50th, stayed there, and is now about 75th for height and somwhere between 75th and 91st for weight, she is slim but solid iyswim!. She was born at home, 14 days late, no stitches, no pain relief! She is 4.5, and weighs about 3 stone (possibly a bit over - similar to ds1 anyway!)
Ds2 - born 10lb2, 99.8th centile, slipped down the centiles, reached a low of 2nd centile, has picked up a bit and is now between the 9th and the 25th. He is 20 months and weighs about 24lb. Again born at home, no pain relief or stitches!