New edition extensively revised to reflect the clinical and laboratory advances of the past decade. The central theme is to provide information on individual anomalies and to connect these anomalies to the malformation syndromes and associated problems, primarily through the use of differential diagnostic tables. Each anomaly is considered from the perspective of the clinician and in the context of current understanding of embryonic and fetal development. In many cases, it has been possible in this edition to describe more comprehensive and accurate epidemiology, details of the underlying molecular biology, new laboratory diagnostic technologies, and enhanced prevention strategies.