Final answer:
The nurse believes the new mother from Ghana refers to the natural contraceptive effect of breastfeeding, known as the amenorrheic effect, which can prevent pregnancy during the postpartum period.
Step-by-step explanation:
The community health nurse understands that the new mom from Ghana believes she won't have to worry about becoming pregnant for the time being likely because of the amenorrheic effect that breastfeeding has on the reproductive system. This effect involves the absence of menses while the mother is breastfeeding, which can serve as a natural form of contraception. This type of contraception falls under the category of natural family planning, which relies on the understanding of a woman's fertility cycle and uses signs such as amenorrhea during breastfeeding to prevent pregnancy.
Although the mother has other options for birth control, such as the birth control shot (Depo-Provera), which requires an injection every three months, or an implantable device like the Implanon rod that is inserted into the arm and is effective for up to three years, the nurse recognizes that the mother's reference likely stems from the traditional belief and practice of lactational amenorrhea as a method of natural family planning.