primordial dwarfism 

Rare Form of Dwarfism Sets Girl Apart From Twin Sister

Sienna "Sinny" Bernal, left, and her twin sister, Sierra, pose for the camera. Courtesy of Chrissy Bernal
By Jessica Doyle
Meet Sierra and Sienna Bernal -- 12-year-old twins from Texas. They both have blonde hair, enjoy shopping and...
The girls are the only twins in the world where one – Sinny – is a primordial dwarf.


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