人口是社会生活的主体，人口活动总离不开家庭这样的社会组织，因此，严格来说，世界各国都有相应的户曰管理措施。尽管各国的形式不尽相同，但在治治社会里，户口管理和政策的基本走向是较为一致的。在美国，也有较系统的人口登记制度。由于几乎所有的婴儿是在医院出生的，因? Population is the main body of social life. Population activities can not be separated from social organizations like the family. Therefore, strictly speaking, all countries in the world have corresponding household management measures. Although the forms vary from one country to another, the basic trend of hukou management and policies in governing the society is more consistent. In the United States, there is also a more systematic system of population registration. Since almost all babies are born in hospitals, because?