Thyrotropin 4.5mIU/L at seven weeks’ gestation, the fetus can be wanted, but medication should be given as prescribed by the doctor. When thyrotropin 4.5mIU/L is found at seven weeks of pregnancy, it suggests combined hypothyroidism, and the fetus can be wanted at this time. However, if left untreated, it may increase the risk of fetal miscarriage, malformations, and congenital defects with mental retardation, so it is necessary to actively give levothyroxine treatment under the guidance of a doctor to control thyrotropin to normal levels. During pregnancy, the obstetrical examination should be reasonable and standardized, so as to timely detect pregnancy complications and provide timely intervention to reduce the risk of pregnancy, and at the same time to ensure the safety of mother and baby during pregnancy. In addition, for pregnant women with hypothyroidism, thyroid function tests should be performed after the birth of the newborn to determine whether hypothyroidism is present and to actively treat it.