Kirsten and everyone,
My first inclination: use principles of the sympto-thermal method to try and
get an idea of whether cyclical changes are occurring, esp. ovulation.  If
so, use the same signs to indicate when pre-ovulatory fertility is at its
peak and seize the time!  If not, consider hormone assays, under guidance of
the appropriate health care provider.
Some mothers are so 'loyal' to a nursling that a new pregnancy seemingly
will not occur while they are BF.  If further investigation suggests this is
the case, explore with the family the implications of this and go from
there.
Rachel Myr
Kristiansand, Norway

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