The Lactational Amenorrhea Method (LAM) is perhaps the most misunderstood method of postpartum contraception. The common belief that "breastfeeding prevents pregnancy" is only true under very specific, strict conditions—and it is ignorance of these conditions that is the cause of many unintended pregnancies.
Three criteria that must be met simultaneously
LAM is effective (according to the WHO-approved protocol) only if all three of the following conditions are met simultaneously:
1. The child is younger than 6 months. After that, additional factors affecting the sexual hormonal status (introduction of solid foods, natural decrease in breastfeeding frequency) dramatically reduce the reliability of the method.
2. Exclusive feeding. This means that the baby is fed only breast milk (or almost only), at regular intervals throughout the day and night — usually no more than 4-6 hours apart during the day and 6 hours at night. Any additional feeding (formula, water, food) significantly weakens the protective effect.
3. Menstruation has not returned. If the menstrual cycle has already resumed after childbirth (even once), this means that ovulation may have already occurred or will occur in the near future — the method is no longer considered reliable.
Why does this mechanism work?
Breastfeeding activates high levels of prolactin, which suppresses gonadotropin-releasing hormone and, consequently, ovulation. This mechanism is only effective when the frequency and intensity of breastfeeding are high enough to maintain a consistently high level of prolactin—which is why the effect is weakened by any additional feedings or by reducing nighttime feedings.
Effectiveness if all three conditions are met
When used strictly, studies show up to 98% effectiveness within the first 6 months — comparable to what many hormonal methods show. However, this rate drops sharply once any of the criteria are no longer met.
Why is this so often misunderstood?
A common but dangerous simplistic belief is: "I'm breastfeeding, so I'm protected" — this ignores the time limit, the requirement of exclusivity, and the criterion of menstruation. Many people continue to hold this belief even after they have introduced complementary foods or their periods have returned — and it is one of the most common causes of unintended pregnancy in the first year after giving birth.
What happens if one criterion is no longer met?
If the child is over 6 months old, has started complementary feeding, or menstruation has returned — it is recommended to start an alternative method of contraception immediately, since ovulation can occur even before menstruation returns — meaning the first cycle may already be fertile before anyone sees a "signal" (bleeding).
Compatible methods during breastfeeding
Not all contraceptive methods are equally suitable in the postpartum period: progestin-containing methods (mini-pill, implant, hormonal IUD) are generally considered safe during breastfeeding, while combined pills containing estrogen may affect milk supply, especially in the early stages — which is why it is important to consult a gynecologist before choosing a specific method.
It does not protect against infections
LAM, like other hormonally based natural mechanisms, does not protect against sexually transmitted infections in any way—a barrier method remains necessary for this purpose.