<prompt> After bih Ductus Venosus anatomically closes by10 to 96 hours1week2 to 3 weeks4 weeks  <response>: The ductus venosus constricts by 10 to 96 hours after bih and is anatomically closed by 2 to 3 weeks, resulting in the formation of the ligamentum venosum.Reference: William;s Obstetrics; 24th edition; Chapter 7; Embryogenesis and Fetal Morphological Development 