title: Ultrasound evidence of sexual difference in fetal size in first trimester.
mesh_terms: D000886:Anthropometry; D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D005865:Gestational Age; D006801:Humans; D008297:Male; D011247:Pregnancy; D012727:Sex Characteristics; D014463:Ultrasonography