Umbilicus and xiphisternum--poor antenatal reference points.
D001827:Body Height; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011631:Pubic Symphysis / Q000033:anatomy & histology; D013249:Sternum / Q000033:anatomy & histology*; D014472:Umbilicus / Q000033:anatomy & histology*; D014989:Xiphoid Bone / Q000033:anatomy & histology*