Not 100% of children born with hypothyroidism will have abnormalities. Patients with hypothyroidism can give birth to a healthy fetus if they are treated with thyroid hormone supplementation during pregnancy, have regular checkups, and maintain their thyroid hormone levels within the normal range. Hypothyroidism will cause insufficient thyroid hormone in the body, however, thyroid hormone is a hormone important for growth and development, especially the development of the nervous system. If a pregnant woman suffers from hypothyroidism and does not replenish enough thyroid hormone in time, it may affect the development of the fetus, leading to serious consequences such as developmental deformities, mental retardation and growth restriction of the child. When a pregnant woman suffers from hypothyroidism, she should supplement thyroid hormones in a timely and regular manner, and undergo regular checkups throughout the pregnancy so that the thyroid hormones can be maintained within the normal range, which generally does not affect the development of the fetus, and the child born is healthy and normal. It is recommended that patients with hypothyroidism should strictly follow the doctor’s instructions for treatment during the preparation for and during pregnancy, so as to avoid affecting the development of the fetus as well as their own health.