Birth weights of infants born at term with familial dysautonomia are significantly less than those of the general population and of their unaffected siblings. This fact suggests that intrauterine growth retardation is an expression of the neurological disorder.
Axelrod FB, Dancis J. Intrauterine Growth Retardation in Familial Dysautonomia. Am J Dis Child. 1973;125(3):379–380. doi:10.1001/archpedi.1973.04160030051009