title: How old is the fetus?
authors.affiliation: Department of Obstetrics and Gynecology, University of New Mexico School of Medicine, Albuquerque 87131.
authors.forename: L A
authors.initials: LA
authors.lastname: Izquierdo
authors.forename: G E
authors.initials: GE
authors.lastname: Sarto
mesh_terms: D005314:Embryonic and Fetal Development; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011263:Pregnancy Trimester, Third; D016216:Ultrasonography, Prenatal