In most cases of sick babies, there is usually no specific symptom, which is caused by the passage of maternal thyroid hormone from the placenta and its entry into the fetus.
Due to the fact that the symptoms of the disease appear gradually and during the first three to six months of life, the diagnosis of the disease is given late and usually the IQ is affected. In many cases, the severity of the disease is mild to moderate, and the symptoms of the disease are not obvious at the beginning of birth, and only by screening newborns, the chance of early diagnosis of the disease is provided. 10% in the first month of birth, 30% by the third month of birth, and 70% at the end of the first year of birth will have clinical symptoms.
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