Collapsed fontanel refers to a sunken fontanel in a newborn baby, which may be caused by malnutrition, cranial dysplasia, dehydration and other diseases, and is mostly treated with general therapy or surgery. If the fontanel is slightly sunken and not accompanied by other symptoms, it is a physiological phenomenon and does not require treatment. 1. Malnutrition: If the newborn is not fed properly for a long time, it can cause malnutrition and wasting, and the fontanel is collapsed, at this time you need to strengthen the feeding, reasonable feeding, if breast milk is not enough, you can increase the formula feeding, to alleviate the situation of fontanel depression. 2. Cranial dysplasia: the above situation can also occur. If the baby’s cranial dysplasia is relatively mild, and does not affect the facial aesthetics, do not need special treatment; if the symptoms are more serious, seriously affecting the facial aesthetics, but also may affect the future growth and development, this time the need for early surgical treatment. 3. Dehydration: when newborns have diarrhea, vomiting, high fever, etc., the fontanel will be collapsed due to excessive loss of body water, you can first oral supplementation of water and electrolytes. If oral supplementation is difficult to correct, intravenous electrolyte supplementation can be used. At the same time, actively treat the original disease, give antipyretic, antiemetic, antidiarrheal treatment. In addition, a slightly sunken fontanel, but the baby does not have fever, vomiting, diarrhea, poor mental health and other symptoms may be a normal physiological phenomenon, do not need to be treated. When the fontanel is sunken in the newborn, it is necessary to consult the doctor in time to clarify the cause of the disease and take appropriate measures.