Presentation is the position of the fetus in relation to the cervix before labor begins. In obstetrics it is further classified by the specific anatomical part of the fetus that is closest to the pelvic inlet of the birth canal. According to the leading part, this is identified as a cephalic, breech, or shoulder presentation. A malpresentation is any presentation other than a vertex presentation (with the top of the head first).
Cephalic presentation (head first) includes:
Vertex (crown) the most common and associated with the fewest complications
Breech presentation (buttocks or feet first):
Presentation (obstetrics). (2016, September 22). In Wikipedia, The Free Encyclopedia. Retrieved 13:12, September 22, 2016, fromhttps://en.wikipedia.org/w/index.php?title=Presentation_(obstetrics)&oldid=740659786