Maternal age, illegitimacy, and postneonatal mortality.
D000328:Adult; D004739:England; D005260:Female; D006297:Health Services Accessibility; D006801:Humans; D007086:Illegitimacy; D007223:Infant; D007226:Infant Mortality; D008423:Maternal Age; D011203:Poverty; D012307:Risk Factors; D014852:Wales