A woman asks about resumption of her menstrual cycle after childbirth. What should the nurse include in the teaching?

Menstrual cycles usually resume immediately after birth.

Menstrual cycles are not expected to return until the baby is weaned from breastfeeding.

The first menstrual period after childbirth is typically lighter than a normal period.

Menstrual cycles can return as early as 3 weeks after childbirth, even while breastfeeding.