This 3D medical animation shows a time lapse view of labor and delivery during normal vaginal birth in a simplified form with only the mother's skeletal structures and the baby in the uterus. Also shown in detail is dilatation (dilation or dilating) and effacement (thinning) of the cervix during childbirth contractions. See more 3D medical animations from Nucleus Medical Art at http://www.nucleusinc.com/youtube