A baby’s fontanel does not normally pulsate. The fontanel usually closes around 8 weeks to 2 years of age and will pulsate during physical situations such as crying, reflecting intracranial pressure. The small gaps between the bones of the skull, such as the frontal, parietal and occipital bones, are called bony sutures, including the coronal suture and herringbone suture, etc., and the large gaps between the bones of the skull are called fontanels. It is normal for a baby’s intracranial pressure to be stable when calm and for the fontanel to be free of throbbing. The fontanel serves as a cushion during changes in intracranial pressure and is seen to pulsate during physiologic situations such as emotional excitement and crying. If the fontanel is persistently convex, accompanied by unexplained crying, lethargy, fever, vomiting (jet-like vomiting) and other manifestations of the baby, it is necessary to be vigilant for intracranial diseases such as encephalitis, meningitis, etc. It is recommended to go to the hospital in time for consultation. 96% of children’s fontanelles close before the age of two, and the throbbing of the fontanel disappears after closure. If the fontanel closes later than in children of the same age, prompt hospitalization is recommended. Clinicians need to take into account other clinical signs, such as head circumference and behavioral development, to determine whether there is an anomaly in the closure of the fontanel.