Pre-school mentally handicapped children.
D000015:Abnormalities, Multiple; D002653:Child Behavior Disorders / Q000150:complications; D002657:Child Development; D002675:Child, Preschool; D005191:Family Characteristics; D005260:Female; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000150:complications* / Q000209:etiology; D007804:Language Development; D008297:Male; D009048:Motor Skills; D012737:Sex Factors