Oct 24, · Primordial dwarfism is a rare and often dangerous group of genetic conditions that result in a small body size and other growth abnormalities. Signs of the condition first appear in the fetal stage Author: Marjorie Hecht. In people with Microcephalic osteodysplastic primordial dwarfism Type II (MOPDII), which is one of the five genetic disorders that are currently grouped under primordial dwarfism, adult brain size is about that of a 3-month-old infant. However, this typically doesn't affect intellectual development. 2 Primordial Dwarfism at Birth.
57 rows · While these people are not known for being the shortest ever, they have been .