Final answer:
The uterus decreases in size through a process called involution, facilitated by breastfeeding, following the delivery of the baby and placenta.
Step-by-step explanation:
After childbirth, the uterus begins the process of involution, where uterine contractions continue for several hours to return the uterus to its pre-pregnancy size. This is a critical period as the mother's abdominal organs also return to their original locations. Breastfeeding is known to facilitate the process of involution. During pregnancy, especially in the third trimester, the uterus expands significantly to accommodate the growing fetus. This expansion can lead to various symptoms such as back pain and increased urination. Once the baby and the placenta are delivered, it is essential for healthcare providers to ensure that the placenta is completely expelled to avoid risks like postpartum hemorrhage.It is a natural and necessary process to return the uterus and mother's anatomy to the pre-pregnancy state.