In vitro fertilization (IVF) involves fertilization outside the body in an artificial environment. IVF was first successfully used for human infertility in 1977 at Bourne Hall in Cambridge, England. To date, tens of thousands of babies have been delivered worldwide as a result of IVF treatment. 在过去的几年里, 试管婴儿怀孕的程序已经变得越来越简单, 更安全更成功.