What is a major risk factor for postpartum hemorrhage?

Uterine atony is recognized as a major risk factor for postpartum hemorrhage because it refers to the failure of the uterus to contract effectively after delivery. When the uterus does not contract, it is unable to close off blood vessels that were supplying the placenta, leading to excessive bleeding. This lack of muscle tone results in increased blood loss, making it a critical condition that healthcare providers must monitor closely during the postpartum period.

The other choices do not directly contribute to the immediate risk of hemorrhage after childbirth. Excessive dietary fiber, low vitamin intake, and poor breastfeeding techniques are not considered direct risk factors for postpartum hemorrhage. While these factors can impact overall maternal health and recovery, they do not specifically relate to the mechanical process of uterine contraction that is vital for preventing hemorrhage. Understanding the significance of uterine atony helps in recognizing the importance of monitoring uterine tone and implementing interventions promptly to manage postpartum hemorrhage effectively.