My DD is just over 17mo and weighs 19lb 12oz. Which is a little over the 9th centile line.
Her length and HC are also fairly small.
She was tracking just under 50th centile for most of her first year, but has now dropped nearly 2 centiles since she started toddling.
She's not actually losing any weight.
She's an active child and a good eater. I just can't understand where she puts it all.
WWYD, would you be worried if you were me?