Dwarfism occurs when an organism is extremely small. In humans, it is sometimes defined as an adult height of less than 147 centimetres (4 ft 10 in), regardless of sex; the average adult height among people with dwarfism is 122 centimetres (4 ft 0 in), although some individuals with dwarfism are slightly taller. [Source: Wikipedia 
]
Common
Uncommon