In a sample of 19 children, a 1997 study found that 3 died before the age of 3, and 2 never learned to walk. The children had various levels of delayed development with developmental quotients from 60 to 85.
Joubert syndrome
Goldenhar syndrome
Kaufman oculocerebrofacial syndrome
Wolfram syndrome
Hurler–Scheie syndrome
TORCH syndrome
Timothy syndrome
Axenfeld–Rieger syndrome