Tomorrow, May 12th, is Cornelia de Lange Syndrome Awareness Day! A very rare condition, Cornelia de Lange Syndrome is a complex diagnosis about which much is still being discovered. We thought we would detail some helpful information, to do our part to spread awareness of this developmental syndrome. In 1933, a Dutch pediatrician named Cornelia Catharina de Lange took on a young patient who was small for her age and had very distinct, somewhat atypical facial characteristics. She set about the task of researching, describing, and documenting what she had discovered. The syndrome she studied now bears her name: Cornelia de Lange Syndrome.