I seriously hope this poor pony got help. This IS something to worry about! When a horse/pony is this young we can fix them, but as they grow older the epiphyseal growth plates closes. The 2nd Phalanx closes around 3month, and the 1st Phalanx closes at 6month. The growth pattern of the leg can (and will) be affected by the distribution of weight on the cartilage.
This one is in need of a very good trim and some plantar and palmar extensions. For more information on this, google: tendon laxity
(and please excuse my poor English).