When it comes to baby abuse people think of those bad people who deliberately and actively harm their babies. But the fact is that many parents in life are intentionally or unintentionally harming their children, for example, when the child is crying, some mothers will hold the child constantly shaking, the more fierce the crying, the more powerful the shaking, until the child falls asleep, in fact, the child is shaking faint past. Likewise we will find children in the car because of the shaking easily seasick, but also easy to fall asleep. Some young fathers, by constantly lifting up and down the child to amuse the child, which is very dangerous and suspected of infant abuse. Infants and toddlers are at their peak of brain development before they are one and a half years old, and the frontal lobe is not fully developed after birth, so the development of brain tissue is slower than the development of the skull, so the cranial cavity is larger, and violent movement of the head can lead to the “shaking rattle effect”, which can cause syncope and brain hemorrhage due to excessive movement of brain tissue, and most commonly, subdural effusion. The surface of brain tissue has a very thin membrane called the arachnoid membrane, under which there is water, and our brain tissue lives in this watery world. Vigorous acceleration or deceleration movements can tear the arachnoid membrane leading to subdural fluid, and because there are often small blood vessels in the arachnoid membrane that can break at the same time, most subdural fluid is bloody. Subdural effusion can lead to vomiting, seizures, paralysis, coma and even life threatening in the affected child, and in the distant future may lead to brain atrophy, hydrocephalus, epilepsy and affect intelligence. Therefore, young parents should not be happy, avoid violent acceleration and deceleration movements of the child’s head before the age of one and a half, go out less, take less cars, and prevent falling out of bed. Once the symptoms appear, the child should be promptly seen by a pediatric neurosurgeon. It is worth noting that many neurosurgeons are not aware of the seriousness of this disease. The treatment of subdural fluid is an emergency rescue, and is basically the same as the treatment of cerebral hemorrhage.