LAM is the use of breastfeeding as a contraceptive method. It is based on the physiologic effect of suckling to suppress ovulation. To use breastfeeding effectively as a contraceptive requires that the mother either feed the baby nothing but breastmilk or, at the very least, breastfeed for almost all feedings. In addition the baby must be less than 6 months old and the mother's menses cannot have returned.

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