Final answer:
The subject is childbirth and labor, which involves the dilation of the cervix and the importance of emotional support and fetal heart rate monitoring.
Step-by-step explanation:
Subject: Health
The subject of the question is childbirth and labor. During labor, the cervix dilates to about 10 cm to allow for the baby and placenta to be expelled during birth. Emotional support and encouragement are important during labor to help the mother cope with the pain and challenges. It is also important to monitor the fetal heart rate during labor to ensure the well-being of the baby.