10.22376/ijpbs.2019.10.1.p1-12 Volume 7 Issue 3 2016 (July - September) Developmental delay and Mental retardation commonly refer to decreased intellectual and functional abilities and are associated with a wide spectrum of disorders. Identification of the condition is very important because it has implications regarding treatment (in potentially treatable disorders), prognosis, genetic counseling of families, and implementation of prevention programs. RAMADEVI.K1, P.THIRUMALAIKOLUNDUSUBRAMANIAN Inherited metabolic disorder, Developmental Delay, Mental retardation 1005-1008