Dwarfism is scientifically called achondroplasia. There are two main types of dwarfism: Disproportionate Dwarfism and Proportionate Dwarfism. The average adult height of people affected with dwarfism is 4 feet tall. There are over 200 different causes (or genetic problems ) that cause dwarfism. October is national dwarfism month. For more information on dwarfism and little people of America visit http://www.lpaonline.org/.