title: Birth-weight distribution patterns in relation to estimated duration of pregnancy in normal infants, spina bifida and Down's syndrome.
mesh_terms: D001724:Birth Weight; D004314:Down Syndrome; D005260:Female; D005306:Fertilization; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D016135:Spinal Dysraphism; D013997:Time Factors