Under 4' or 4'6" A 16 year old girl who is headed for an adult height of under 4 feet (or 4ft. 6in.) can be described as dwarf-sized. Dwarfism is a medical term for persons with problems in their bones that prevent normal height growth. Achondroplastic dwarfs are the most common (women are about 4 feet tall). A child who is very short should be seen by a doctor. People do not like to be called midgets or dwarfs.