Well, one of the ways lactation spaces births is by lowering progesterone
and shortening the luteal phase, which means a fertilized egg doesn't have
much time to implant before the uterine lining is shed.  So, yes, that
could result in very, very early miscarriages, virtually undetectable
unless a mom is charting.   If a mom has borderline progesterone levels,
because of breastfeeding or just because, it can also cause later
miscarriage, in the first trimester.  This can be overcome with prescribed
progesterone supplementation or an OTC progesterone cream where mom needs
something to get her over the hump until baby's placenta starts producing
enough.

That's the thing right there: once a woman is a few weeks along, baby's
placenta will take care of her progesterone levels.  Early in pregnancy is
where there is the most concern.

So yes, it is a real concern.

Lynn Carter OFS LLLL IBCLC
Missouri, USA

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