In this form of abnormal presentation, a child's head emerges from the birth canal, but one of their shoulders remains stuck behind the mother's pelvis. (banvillelaw.com)
Review: onset of schizophrenia before 22 years of age is associated with abnormal presentation at birth and complicated caesarean birth (ebmh.bmj.com)
An ultrasound can confirm abnormal presentation. (modernmom.com)