The human skull is made up of six bones, and the fontanelle is a diamond-shaped bone intersection in the center of the front of the baby’s head, about 1-2 cm at birth. The fontanelle is divided into the fontanelle and the post fontanelle, and usually the sunken fontanelle refers to the sunken fontanelle, which can be judged by the naked eye and the baby’s performance. 1. The method of judging the sunken fontanel 1. Under normal circumstances, the baby’s fontanel is flat and slightly sunken when standing. If the top of the head has a depression visible to the naked eye, it can be judged as a sunken fontanelle. 2. Judgment according to the symptoms The sunken fontanelle may be caused by the baby’s lack of water, such as the baby appears less urine, dry skin, sunken eye sockets, weight loss, crying without tears, etc., need to consider dehydration, will be accompanied by the sunken fontanelle. Causes of sunken fontanelle 1.If the baby is having diarrhea, fever or using a lot of dehydrating agent, the baby will have the performance of dehydration and the fontanelle will be sunken, which suggests that the baby should be given liquid supplement; 2.Long-term malnutrition; 3.When there is shock or hemorrhage in the body. Care measures for sunken fontanel 1.If the baby has vomiting and diarrhea, the baby should be hydrated in time to avoid circulatory failure; 2.If the baby has malnutrition, attention should be paid to finding the cause, strengthening nutrition and reasonable feeding; 3. Observe the shape of fontanel more often to ensure the healthy development of the baby.