Just before giving birth to her first child why did mrs plum yell?

Mrs. Plum likely yelled due to the intense pain and pressure of labor contractions, which can be overwhelming for many women. The physiological process of childbirth involves the uterus contracting to push the baby through the birth canal, causing discomfort and often leading to vocalizations or verbal expressions of pain. Additionally, the emotional and psychological aspects of giving birth for the first time can also contribute to heightened stress and anxiety, leading to vocal outbursts such as yelling.