青少年避孕、节育知识落后;性观念开放、婚前性行为增多;外出务工人员增加,其给父母、当地计划生育等部门的管理增加了难度;妇女避孕失败、生殖保健知识与服务缺陷等方面的原因导致每年意外妊娠发生率不断增加。世界卫生组织估计,全球每 Adolescent contraception, lack of knowledge of birth control; sexual attitudes open, increased premarital sex; increased migrant workers, their parents, local family planning and other departments of the management more difficult; women contraceptive failure, reproductive health knowledge and service defects and other reasons As a result, the incidence of unwanted pregnancies is on an increasing trend every year. WHO estimates that every one in the world