Most babies’ sudden screams are normal, common in babies around 4-5 months of age, and are a normal response to language development. If the baby in addition to occasional screaming, the general condition is good, can be amused, sensitive mold, see people will take the initiative to laugh, good mental state, no need to worry too much, observation can be. If the baby suddenly screams, but the mental state is depressed, accompanied by vomiting, lethargy and other symptoms, we should pay attention to the possibility of meningitis, and bring the baby to the hospital in a timely manner. If the baby screams while making less eye contact with others, be aware of the possibility of autism in children.