My DS just doesn't seem to grow! I have put off going to the health visitor or GP, because I think they'll just say he's fine and he'll get there eventually. Both dh and I are average height 5'11" and 5'8". DS is the smallest in his class at nursery by a long shot and many of the 2-3 yo tower over him.
On the plus side, he's cheap to run on clothes and shoes - I'm bringing out winter clothes this year he's had from two years ago and has only gone up one shoe size in 18m!! Advice/reassurance would be gratefully accepted