Extracerebral widening is a diagnosis made by the infant’s examination of a cranial CT or cranial magnetic resonance imaging (MRI) film, and in some cases the diagnosis is extracerebral hydrocephalus or even cerebral dysplasia. Some of the examined children receive a lot of treatment, including injectable drugs and various rehabilitation treatments. The child suffers a lot of pain and the parents suffer mentally and financially. In fact, the widening of the extracerebral gaps shown on the infant’s head CT or head MRI (magnetic resonance imaging) film is normal for babies with normal-sized heads. This is because the skull grows quickly and the brain tissue grows slowly, showing gaps outside the brain. Here is an example of a baby born prematurely with a widened extracerebral space at 3 months of age, which disappeared at 1 year and 2 months of age, with normal intellectual development. Yang Yang, female, delivered by cesarean section at 29w, mother had a history of fetal preservation during pregnancy, no abnormalities in the rest of pregnancy examination, hyperbilirubinemia, neonatal anemia and neonatal pneumonia in the neonatal period. There were no abnormalities in fundus and auditory evoked potentials, and the extracerebral space was widened at 3 months of age on cranial magnetic resonance imaging (MRI). He came to the clinic regularly since 1 month of corrected months of age, and was given instructions on feeding, care and motor and intelligence training. No treatment with how drugs or therapeutic instruments was given. No abnormality was found in each neuromotor examination, and the IQ test was normal at 6 and 17 months of age. the extracerebral gaps basically disappeared at 1 year and 2 months of age. In this case, the preterm infant had a widened extracerebral space at 3 months of age and the widened extracerebral space had largely disappeared by 1 year and 2 months of age. The IQ test was normal. There are also many babies born at full term who have widened extracerebral gaps. I followed 50 cases of babies born at full term who had widened extracerebral gaps up to the age of 2 years, and they stopped any medication or instrumentation and were given only early education guidance at home. Some of these babies had a repeat cranial MRI and the widening of the extracerebral space disappeared. Therefore, the widening of the extracerebral space is a normal developmental process in normal infants or at-risk infants, such as preterm infants, and does not require treatment. The development of the brain is the material basis of the infant’s intelligence, which means that the better the development of the brain, the higher the intelligence, and the development of the brain is closely related to nutrition. Because the brain itself is also composed of cells, it needs various nutrients. First of all, protein is needed to supply the synthesis of brain cells, fat is also needed to supply the growth of nerve myelin, glucose is also needed to supply energy for brain cell activities, and various vitamins, minerals and water are all indispensable nutrients for brain development. There are two critical periods for the development of brain cells. One is the fetal period, especially around 10 to 18 weeks of gestation, which is the peak of the first brain cell division. If the nutrition is sufficient at this time, it can promote the division of brain cells, so that the number of brain cells increases and the brain develops better, providing conditions for optimal reproduction after birth. Therefore, pregnant women should eat more protein-rich foods such as eggs, lean meat, milk, fish and soy products during pregnancy, as well as foods containing vitamins and inorganic salts such as fresh vegetables and fruits, and foods containing more iodine and calcium such as seaweed, nori, sea rice and shrimp. From birth to 2 weeks of age, the infant is also a critical period for brain development, and nutrition should be adequate. If there is sufficient breast milk, breastfeeding alone for 6 months after birth can ensure the sound development of the child’s brain during this period. Later, when the child is older, it is not possible to rely exclusively on breast milk, and supplementary foods should be added. Among them, sugar, protein and trace elements are the most important. The brain as the human body’s command, to consume 1/5 to 1/4 of the body’s energy, so to supplement sufficient sugar, in order to supply the brain energy. Some scientists have found that eating sugary foods can stimulate the activity of brain cells, which has a great effect on brain development. Protein also has an important role for the brain, which not only promotes the increase in the number of brain cells, but also promotes the physiological activities of the brain. Among the trace elements, zinc and copper are the most important. Some scientists have pointed out that the hair of students who study well has a higher content of the trace elements zinc and copper. Therefore, it is important to give children more food containing sugar, protein and food containing zinc and copper, such as pork, poultry, eggs, milk, liver, seafood, mollusks, crustaceans, peanut rice, etc.