[Photo provided to chinadaily.com.cn]

Maybe you have found part of the problem. It has been confirmed that the pregnancy rate of normal couples are between20 to 25 percent for each cycle. The World Health Organization defines infertile as a couple who couldn't have a baby with a regular sex life without contraception for one year.

Obviously Mrs. Wang couldn't be diagnosed as infertility; we suggested she just keep trying. Mrs. Zhang seemed to do everything scientifically correct, but just knew the one side of pregnancy since ovulation days are hard to prognosis and vitality of sperm may decrease for a long interval. Besides, as a medical intervention artificial reproductive technology may cause complications. Mrs. Zhang had no indication for artificial reproductive technology so we suggested she drop off nervousness and to stop calculating ovulation days.

Mrs. Wang and Mrs. Zhang got pregnant without a doctor's help and any medical interventions. Mrs. Li finally followed a doctor's advice to have her husband tested. The semen report showed no sperm and the couple needed artificial reproductive technology for ingratiation.