The incidence of low birthweight in children with severe mental retardation.
D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007230:Infant, Low Birth Weight / Q000523:psychology*; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000209:etiology*; D008607:Intellectual Disability / Q000209:etiology*; D010414:Pennsylvania; D012307:Risk Factors