Babies know everything is not talking generally common causes of physiological and pathological two, different causes of examination and treatment methods are different, such as active family intervention or timely medical symptomatic treatment and so on. 1. Physiological reasons: generally babies within 2 years of age less talk or do not speak is relatively normal, generally may be due to poor family language environment, can be positive family intervention to guide the baby to speak more. Such as more communication with the baby, family members also pay attention to language expression, pay attention to the diversity of communication methods. 2. Pathological causes: If the baby is older than 2-3 years old and still can not speak, may be related to diseases of the organ of sound, central nervous system disease, mental retardation, autism and other causes of delayed or impaired language development, need to identify the cause of the disease and then carry out active symptomatic treatment to gradually restore the language function. If your baby knows everything but can’t speak, we suggest that you go to a specialized children’s hospital for a comprehensive examination and evaluation, and then follow the doctor’s instructions to carry out positive and formal intervention to let your baby speak as soon as possible.