有一门新兴的精神病学叫“婴幼儿精神病学”。你也许会问,婴幼儿怎么会有精神病呢?而且即使他(她)有病,又怎么样才能诊断呢?回答这类问题要从什么是精神病说起。很多人听人说有精神病,就联想到疯子,而疯子是什么呢?就是那些大吵大闹,一会儿哭、一会儿笑的人,而且他(她)们常常给周围人带来危险。其实,精神不正常的人不见得就是疯疯闹闹的,而且许多精神异常的问题都是有生理生化原因的。在另外一方面,精神病也和其它病一样,如果发现得早,治疗得及时, There is a new psychiatry called “infant psychiatry ”. You may ask how infants and young children have mental illness. And even if he or she is sick, how can we diagnose it? The answer to such questions depends on what is mental illness. Many people hear people say they have mental illness and they think of madmen. What are mad people? They are those who are uproaring, crying and laughing for a while, and they often bring danger to the people around them. In fact, people with mental disorders are not necessarily mad, and many mental disorders have physiological and biochemical causes. On the other hand, mental illness is just like other diseases. If it is found early and treated promptly,