Hello, I would be happy to help you with your question. In the setting of untreated subclinical hypothyroidism (meaning the patient does not know that they have a problem), there is an effect on the IQ scores of those children. This is a well known fact. But this risk is virtually eliminated once her thyroid is normalized, and the diagnosis in your daughter s case is early enough that this should not be a significant issue. She needs the same labs checked every 6 weeks throughout the pregnancy. Also, she should ask about labs related to thyroid auto-antibodies, which if positive, change the way the fetus is followed. I hope that this helps and good luck!