Definition of multiple congenital abnormalities.

The recommended definition of multiple congenital abnormalities is "a concurrence of (1) two or more (2) different (i.e. different localized errors in morphogenesis) (3) major congenital abnormalities in the same person". The baseline data of multiple congenital abnormalities in the Surveillance of the Hungarian Congenital Anomalies, 1970-1976, are shown.