Final answer:
The process described in the question is called involution, where the uterus contracts and gradually returns to its prepregnant state.
Step-by-step explanation:
The process described in the question is called involution. After delivery, the uterus contracts and gradually returns to its prepregnant state through a series of contractions. These contractions help the uterus to shrink back to its original size and shape, and also assist in the return of the abdominal organs to their pre-pregnancy positions.