If your baby has a bulge in the middle of the fontanelle, it is generally caused by cranial hypertension. There are two kinds of cases, one is benign cranial hypertension and the other is pathological, which may be meningitis or something growing inside the skull, intracranial occupancy, intracranial hemorrhage. If a baby has a cold and fever, there can be a bulge in the middle of the fontanelle, and when the fever subsides and the cold gets better, the fontanelle will also recover, but if there is an intracranial infection and the condition is much more serious, it is recommended to consult a hospital because the baby’s symptoms are atypical, and it is because it plays a compensatory role by reducing the cranial hypertension through the bulge of the brain, so the baby’s symptoms will be atypical. In older children with closed fontanelle, if they have cranial hypertension, they may have headaches, vomiting, and poor mental performance. But in small children, because the fontanelle is not closed, it reduces the symptoms of cranial hypertension by protruding, so they may not necessarily have headaches, vomiting, or crying and restlessness.