ds is light and little. He was 8.5kg at Christmas, when he was 19 months, and wears 12- or 12-18 month clothes. He's always hung around the lowest centile, occasionally dipping off. But then dh is 5'2 and I'm 5'1, and neither of us are all that big framed. He is bright, alert and healthy. I agree the obsession with weight and centiles can be very worrying and damaging. Surely human development can't always be plotted neatly on a curve.
harpsi (hi, it's FiT ), I think it's all part of the deep anxiety we tend to have as mothers, as to are we doing the right/best thing for our baby. Add in health professionals generally liking things to be neatly plottable, and the tendency to competition and comparison among new mothers (I lurk on a German forum my SIL uses, and so many of the mothers have proud lists of each check and their baby's weight at it underneath their posts - leaving me, usually, spluttering 'blinking hell, that one weighed more at 8 months than ds did at 18'), and I can well see the obsession- and anxiety-causing potential these things have.
dh, btw, is small by anyone's standards, but isn't sensitive about his height at all - he carries it wonderfully well, in fact. I'm glad of that - he'll be a fab role model for ds, who is unlikely to be a giant.