Dwarfism

Exact causes of primordial dwarfism are not known, but it  is due to genetic factors. When the embryo is formed by receiving one responsible gene for primordial dwarfism from each parent, then the child gets this condition. The parent themselves might not show this condition, but they might have the gene in a recessive manner which indicates that the condition is autosomal recessive inheritance. 

There are no statistics regarding this condition due to the small number of people with it.