Midget vs dwarf
Some people use the two terms interchangeably, but often one uses the term "midget" in a rather demeaning manner to ridicule someone of small statue.
..I.E. "that little midget is annoying"
dwarfism is a genetic condition in which a person is very small and short--the shortest dwarf in the world is a woman (jyoti amge ) of approximatey 23 inches tall!