5 doctors weighed in:
What happens to the baby if the father is hypothyroid and the mother is hyperthyroid?
5 doctors weighed in

Dr. Melissa Young
Internal Medicine - Endocrinology
4 doctors agree
In brief: During pregnancy?
Do you mean during the pregnancy? The risk of preterm labor is higher if mom if hyperthyroid.
If her thyroid antibodies are high, baby can be temporarily hyperthyroid at birth. Meds used for hyperthyroid can sometimes cause birth defects. If you mean long term effects on baby, having 2 parents with thyroid disease increases the likelihood baby will someday get it too.

In brief: During pregnancy?
Do you mean during the pregnancy? The risk of preterm labor is higher if mom if hyperthyroid.
If her thyroid antibodies are high, baby can be temporarily hyperthyroid at birth. Meds used for hyperthyroid can sometimes cause birth defects. If you mean long term effects on baby, having 2 parents with thyroid disease increases the likelihood baby will someday get it too.
Dr. Melissa Young
Dr. Melissa Young
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Dr. Susan Wingo
Internal Medicine - Endocrinology
In brief: Hard to predict
First, I agree with Dr Youg's answer, and recommend very close followup for you thyroid condition during pregnancy.
As far as the baby's chances for having thyroid problems, it would be nice if the hypo from dad & hyper from mom canceled each other out, but that is not how it works. Most likely both parents make antibodies targeting thyroid proteins, (continued)

In brief: Hard to predict
First, I agree with Dr Youg's answer, and recommend very close followup for you thyroid condition during pregnancy.
As far as the baby's chances for having thyroid problems, it would be nice if the hypo from dad & hyper from mom canceled each other out, but that is not how it works. Most likely both parents make antibodies targeting thyroid proteins, (continued)
Dr. Susan Wingo
Dr. Susan Wingo
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1 comment
Dr. Susan Wingo
so that the baby will have a higher-than-average chance of someday making antibodies to thyroid proteins and having thyroid disease herself. Early on, that could result in slow growth or developmental delays. Thyroid problems could happen in infancy, in childhood, in adulthood, or never. Make sure you pediatrician knows the family history, and that your future young adult child knows this as well
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