Shirley Returned to Full-Time Employment Six Weeks After Her Baby's

Shirley returned to full-time employment six weeks after her baby's birth. She exclusively breast-fed during her maternity leave, and then pumped her breast milk when she returned to work. Now her baby is 3 months old and drinks some formula when at day care. Shirley wants to stop breast-feeding. If you were a pediatric nurse, what would you say to her?

A) She can quit breast-feeding because all of its benefits are achieved within the first three months.
B) She should quit breast-feeding because it is only beneficial if the baby doesn't drink any formula.
C) She should keep breast-feeding until the baby begins to eat solid foods, which is the point at which breast milk loses its nutritional value.
D) She should keep breast-feeding for at least six months because breast-fed babies are less likely to get sick.