From Mary Shomon,
Your Guide to Thyroid Disease.
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Good news is that, in most cases, if you have thyroid problems, you can safely breastfeed, whether your thyroid condition developed before, during or after pregnancy. Of course, you should always talk to your doctor or your baby's doctor for the best recommendation for you and your own case. See the detailed Frequently Asked Questions list for answers to some common questions about thyroid problems and issues regarding lactation and breastfeeding for nursing mothers with thyroid disease:

• Should I continue taking my thyroid hormone drugs (i.e., Synthroid, Levoxyl, Armour, Thyrolar) when I'm breastfeeding?
• Does hypothyroidism cause any breastfeeding problems?
• Will the thyroid hormone pass through my milk to the baby?
• What kinds of diagnostic tests and treatments can I have while breastfeeding?

FOR MORE INFORMATION ON THYROID DISEASE AND BREASTFEEDING

• Frequently Asked Questions About Breastfeeding and Thyroid Disease
• Thyroid Disease and Pregnancy -- The range of issues related to fertility, pregnancy and their relationship to thyroid disease are explored, and helpful guidelines are provided on how to have a healthy pregnancy with thyroid disease.
• Breastfeeding Basics, From About Pregnancy -- Information to get you started on breastfeeding your baby