Wanderingsoul, the thing I think that might be confusing you is that women's breasts will produce milk after pregnancy for as long as it is being consumed. A woman could conceivably continue to use a breast pump after weaning her baby which would make the production of milk continue.

In years gone by, wet nurses were employed to breast feed other women's babies, since milk production can go on for years after childbirth as long as it is being expressed somehow from the breast on a regular basis.

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