Bilateral temporoparietal gap widening in a 4-year-old baby is generally a normal physiological phenomenon and does not require special treatment, and it is recommended to go to the hospital for regular checkups to observe whether there are other abnormalities, so as to avoid other abnormalities that can’t be dealt with in a timely manner. In general, the baby’s skull develops faster, but the brain develops relatively slower, which leads to the phenomenon of widening of the extracerebral space, if the development is normal, can rule out pathological conditions, do not need to worry too much. If the development is normal, pathology can be ruled out and there is no need to worry too much. You can follow the doctor’s instructions to supplement calcium and cod liver oil and other nutrients, and check the body regularly to understand the development. Bilateral widening of the temporoparietal hiatus in 4-year-old babies may also be due to hydrocephalus, cerebral dysplasia, and asynchronous development of the skull and brain tissues, so you can go to the hospital for a detailed examination and treatment according to the doctor’s advice. Usually need to pay more attention, to make a reasonable diet plan for the baby, to ensure the adequate intake of all nutrients, to avoid malnutrition, regular and good examination, to avoid other abnormalities.