Final answer:
Patient behaviors that indicate birth is imminent include regular contractions, the expulsion of the mucus plug ('bloody show'), cervical dilation, and the rupture of the amniotic sac.
Step-by-step explanation:
Labor is characterized by a series of patient behaviors that indicate birth is imminent. These include the presence of regular contractions that become more frequent and powerful with time, and do not abate with hydration or rest.
Another sign is the expulsion of the mucus plug, also known as the 'bloody show,' which occurs approximately 1-2 days before true labor begins. Additionally, the cervix dilating to a certain extent and the amniotic sac rupturing are also signs that birth is approaching.