I nannied a little guy who wouldn't make it to 4 even with a 40lb limit. He was 40lb just after his second birthday. Not an ounce of fat on him, just tall and solid. His dad is exactly the same. The kid was a tank. He is 4.5 now and is about the size of a 7 year old.
Supermom, living the good and simple life, trying to remember how fortunate I am.