人有喜怒哀乐，哭也是一种情绪的表现。初生婴儿在饥饿、疼痛、尿布潮湿或有其他 不适时，会张嘴啼哭。对于这种啼哭，父母比较容易理解，常常会采取安慰的态度。可是随 着年龄的增长，小儿啼哭往往掺杂了更为复杂的因素。例如，当要求不能得到满足时，或遇 到不高兴的事情时， People have emotions, crying is also a manifestation of emotion. Newborn babies mouth open when hungry, sore, wet diapers, or otherwise ill. For such crying, parents are more likely to understand and often take a soothing attitude. However, with age, children cry more often with more complicated elements. For example, when the requirements can not be met, or when they are unhappy,