Congenital hypothyroidism is one of the common intellectual disabilities in childhood. Congenital hypothyroidism is also called congenital hypothyroidism, also known as cretinism. Generally, there are no obvious symptoms in the early stage, and when symptoms appear, it may be too late and the treatment is not effective. The appearance of symptoms can have a great impact on the intellectual development of children, resulting in short stature and low intelligence. If the disease is detected within 2 months, treated promptly, and the thyroid function is kept normal for a long time, intelligence can basically return to normal. If it is detected and treated after 10 months of age, the IQ can only reach about 80% of normal, and if it is detected after more than 2 years of age, the intellectual development is relatively low. Congenital hypothyroidism is often manifested as follows: 1) late pregnancy and relatively little fetal movement during pregnancy; 2) heavy weight at birth, but normal length and head circumference, and enlarged fontanelle in front and behind; 3) late discharge of meconium after birth, and frequent abdominal distension; 4) long sleeping hours and inactivity after birth; 5) slow regression of jaundice after birth; 6) little food and poor feeding; 7) poor feeding. 7. sometimes there are symptoms such as difficulty in breathing and umbilical hernia. Congenital hypothyroidism seriously affects the health of children and needs to be treated promptly.