A nurse is caring for a client who is postpartum and requests information about contraception. Which of the following instructions should the nurse include?

Rationale: A. "You should avoid vaginal spermicides while breastfeeding.": Vaginal spermicides are generally considered safe during breastfeeding. They do not contain hormones and do not affect milk production, so avoidance is not typically necessary unless the client has specific contraindications. B. "The lactation amenorrhea method is effective for your first year postpartum.": This method is only effective during the first 6 months postpartum, provided the mother is exclusively breastfeeding and menstruation has not resumed. Beyond that period, the risk of ovulation increases and it becomes unreliable. C. "Place the transdermal birth control patch on your upper outer arm.": The patch can be applied to several sites, including the upper outer arm, abdomen, buttock, or upper torso. This is an appropriate instruction and part of standard patient teaching for transdermal contraceptive use. D. "You can continue to use the diaphragm you used before your pregnancy.": The diaphragm often requires refitting postpartum due to changes in vaginal tone and cervix position. Using the same diaphragm without evaluation could reduce effectiveness and increase risk of unintended pregnancy.