Whether a wide fontanel is important or not depends on the age of the baby. In the vast majority of cases, it does not matter. The posterior fontanel closes around 2 months after birth; while the anterior fontanel is around 1-2cm at birth, and even up to 3.6cm in individual babies, and mostly closes at 1.5-2 years of age. If the fontanel is too large or does not close within the normal time, we need to be alert to the possibility of diseases such as cerebral edema, intracranial hypertension intracranial hemorrhage, hypothyroidism and so on. If the above situation occurs, the doctor can be combined with clinical examination, if necessary, under the guidance of the doctor to improve the cranial ultrasound, cranial MRI, thyroid function complete set of examination to clarify whether there is any abnormality. If there is any abnormality, it can be treated according to the doctor’s instructions. Parents can carefully observe the baby’s condition, if there are abnormalities such as increased fontanel tension, too large or too small fontanel, it is recommended to consult a doctor in time to avoid delaying the condition.