2 yr old growth

Hi
My two yr old boys Plunket nurse is constantly on my case about my boys height. He's 83cm and 13kg. He's on the 75th percentile for weight and the 0.04th percentile for height he keeps dropping down the percentiles.
And she wanted me to go see our gp as there's more than 4 percentiles difference between his height and weight.
My gp wasn't sure so has sent us to a specialist.
On both sides there are a lot of short genes and I've told the Plunket nurse this but she still hassles me about it whenever we see her.
Just wondering if anyone else has had any growth issues like this??