Intellectual performance of children of mothers with an untreated thyroid disorder in the first trimester of pregnancy.

Introduction: The focus of the present study was the importance of the mother's thyroid function for foetal development in the first trimester, when the baby is totally dependent on the mother for thyroid hormones.

Material And Methods: The study consisted in testing the intellectual performance of children with both euthyroid and thyroid-dysfunction mothers. The experimental group comprised 60 children of mothers with an untreated thyroid disorder in the first trimester of their pregnancy (TSH≥3.