I've read on several posts that people will measure the cannon bone and predict how tall the foal will mature to. Is this an accurate way to determine height? My filly, 5 1/2 weeks old, has short stubby legs and stocky body (quarter horse style) and my colt 2 weeks old has legs a mile long and a very small petite body. They are both the same 22-23" right now! Both Mares are 32" and Both Sires are 29". Any predictions here???