According to a relatively extensive analysis of infertility research, the primary cause of female infertility is ovulation disorder (37%), fallopian tube abnormality (32%), unexplained infertility (17%), and endometriosis. Symptoms (5%), cervical factors (5%) and others (4%), mainly ovulation disorders, fallopian tube factors, and endometrial receptivity abnormalities.
The main causes of male infertility are abnormal spermatogenesis and impaired sperm discharge. The more common ones are oligospermia, teratogenic sperm, retrograde ejaculation, and varicocele. In addition, scrotum and chronic prostatitis can also cause male infertility.
Generally speaking, fertility is inversely proportional to age. Female fertility gradually decreases with age and cannot be restored. According to a number of studies conducted by the National Health Service in the United States for more than 20 years, 35 years old is the age at which female fertility begins to decline, and it is difficult to conceive naturally and healthy within one year.
Male and female reproductive functions are normal, but infertility caused by autoimmunity or allogeneic immunity of reproductive system antigens. Sperm, seminal plasma, zona pellucida and ovarian antigens of the reproductive system can produce autoimmunity or alloimmunity under certain circumstances, and produce corresponding antibodies to prevent the combination of sperm and egg, leading to infertility.
Chromosomal disease is a very serious genetic disease, usually accompanied by fetal developmental abnormalities or mental retardation after birth, and it is also one of the most important causes of fetal abortion and infertility. Editor's reminder: Older women who give birth (>=35) must consider the impact of chromosomal problems on fertility.
Statistics show that the probability of a female being pregnant with a male baby is 1/2, while the probability of twins is only 1/89. If two pairs of twins are born consecutively, the probability will reach 1/8000. Test tube baby can easily solve the problems of having boys and girls, twins, and girl and boy twins (domestic (China) is illegal, Thailand is legal).
The contents of third-party assisted reproduction mainly include borrowing sperm, borrowing eggs, and third-party assisted reproduction (domestic[China] is illegal). Borrowing sperm/egg means that one or both of the couple has lost the ability to produce sperm or eggs, and need to use sperm and eggs of third party to complete the cycle. Third-party assisted reproduction refers to the inability of a woman's uterus to conceive a fetus and requires the help of a third party to complete it.