<prompt> Causes of breech presentation are:a Hydrocephalusb Oligohydramniosc Pelvic contracture d Placenta praeviaacdadbcbde  <response>: At 28 weeks of pregnancy, approximately 20 of women have breech presentation. The fetus undergoes spontaneous version usually between 30th and 34th week. This corrects the breech position such that, at term only 3 of pregnant women have breech presentation.Any maternal or fetal condition, which prevents this spontaneous version will result in a persistent breech presentation. 