Lactational Amenorrhea Method (LAM) is >98% effective ONLY when all three criteria are simultaneously met. Which set correctly states these criteria?

• A Exclusive breastfeeding + amenorrhea + infant <6 months ✓
• B Exclusive breastfeeding + amenorrhea + infant <4 months
• C Partial breastfeeding + amenorrhea + infant <6 months
• D Exclusive breastfeeding + regular menstruation + infant <6 months

Explanation

LAM requires all three conditions simultaneously: (1) exclusive or nearly-exclusive breastfeeding on demand, day and night; (2) amenorrhea — no return of menses since delivery; (3) infant age <6 months. Failure of any single criterion (partial breastfeeding, first period, or infant exceeds 6 months) necessitates initiation of an additional contraceptive method. The mechanism is prolactin-mediated suppression of GnRH pulsatility, inhibiting ovulation.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.