Final answer:
The process of the body returning to a non-pregnant state after birth is called involution.
Step-by-step explanation:
The process of the body returning to a non-pregnant state 6-8 weeks after birth is called involution. During this process, the uterus gradually contracts and reduces in size to its pre-pregnancy state. Uterine involution is facilitated by breastfeeding, which also helps the abdominal organs to return to their pre-pregnancy locations.