When a baby first learns to crawl back is very dangerous, because he is curious about everything around him and wants to try it. For this reason babies learn to crawl or learn to walk after less collision. Touching other places are generally not a big problem, falling head is not the same, then the baby fell head where the most dangerous? If the baby fell down is the back of the head to the ground, is the most dangerous, because the back of the head is the nerve center is located, once the fall is very easy to occur intracranial hemorrhage, thus leaving sequelae, or even more serious consequences. When the baby fell and landed on his head, we should pay attention to observe and be alert to the following situations: 1, there is no immediate crying, if the baby fell after more than 1 minute before crying or not crying, need to be alert. 2, after the fall, after coaxing to sleep, sleep time is significantly longer than the usual sleep time. 3.Vomiting occurs more than once or frequently, and the vomiting is not caused by eating. 4.Observe the mental condition of the baby after the fall, whether there is obvious sluggishness, and compare with the usual activities to see if they are abnormal. 5, immediately after the fall, the phenomenon of fainting. 6, within two days after the fall, there was recurrent vomiting, sleep, poor spirit or violent crying. 7. Within two days after the fall, bleeding from the nose or ears, running water, unequal pupil size, etc. need to be alert. The above situations require immediate medical attention.