Dwarfism

[Dave Paprocki]

(in medical or technical contexts) unusually or abnormally low stature or small size.

[Justin Bieber]

A fairly small person who is angry at the world because of how short he/she is. There may be a few [side effects] to this symptom including [pouncing] at people and constantly talking about how you’re actually the same [height] as a taller person/friend

[Kai]

a condition that causes a person to be much smaller than the usual size: