Level 1: The Development History of IVF Technology With the continuous advancement of medical technology, IVF technology is also constantly developing. IVF technology first originated in the 1970s. At that time, human fertilization could only be carried out through the fallopian tube drainage method. However, this method had a low success rate and was subject to many limitations. As time goes by, people have gradually mastered more advanced IVF technologies, such as ultrasound-guided egg retrieval, embryo culture, embryo transfer, etc. The application of these new technologies has greatly improved the success rate of IVF. Level 2: Principles of IVF to give birth to a boy