During the postpartum period, the correct response is:
The mother experiences hormonal changes.
The postpartum period refers to the time after the delivery of the baby, during which the mother's body goes through various changes, including hormonal adjustments. The other options listed (the baby being pushed out of the uterus, the umbilical cord being cut, and the afterbirth being delivered) occur during the labor and delivery process, not the postpartum period.