Fetal alcohol syndrome (FAS)is the leading cause of mental retardation worldwide but is also the foremost preventable cause of neurobehavioral and developmental abnormalities. It is equally important to know spectrum of disorders due to maternal alcoholism during pregnancy such as Fetal alcohol spectrum disorder (FASD)in order to identify and treat affected child and family effectively. This article aims to create awareness among practising clinicians most of whom are only aware of phenotypical variant of FASD which is FAS.In this article we discuss those aspects of FASD relevant to the clinician such as: terminological ambiguity, assessment, diagnosis and prevention.