Dear Lisa and everyone,
We indicated some time ago (before other time pressures ran us over!) that
we'd had some interesting experiences with breastfeeding mothers who have
thyroid disorders. Fairly briefly, if the woman is fortunate enough to have
her problem diagnosed (more difficult if she is pregnant or lactating) then
she can be treated and continue to breastfeed with no more difficulties than
anyone else has. For hyperthyroidism some drugs are certainly more
preferable than others for a breastfeeding woman and at least one is
contraindicated.

Anne Bovey and Robyn Noble, Brisbane, Australia