Sunken fontanel is usually common in newborn babies, it may be a normal physiological phenomenon, or it may be caused by malnutrition, diarrhea, cranial dysplasia, etc. The patient can improve the symptoms through general treatment and medication. 1. Malnutrition: When newborn babies are malnourished due to improper feeding, it may cause fontanel depression. Parents should strengthen the nutrition of babies with reasonable diet and correct feeding to improve malnutrition and alleviate the halothorax depression. 2. Diarrhea: newborn patients in severe vomiting, diarrhea, resulting in dehydration, may cause fontanel depression, can go to the hospital for infusion of fluids to replenish fluids, improve the situation of fontanel depression. 3. Cranial dysplasia: If the symptoms of cranial dysplasia are mild and do not affect facial aesthetics, no special treatment is needed; if the symptoms are more serious, seriously affecting facial aesthetics, and may also affect the development of the future, then surgery is needed as soon as possible, to improve the fontanel depression. In addition, adults with unclosed fontanelles may also have sunken fontanelles due to traumatic brain injury or fractures. It is recommended that the patient should consult a doctor in time to identify the cause of the disease.