Why does the second child miscarry? What factors cause this phenomenon?

After the relaxation of the two-child policy, some women wanted a second child. The factors that may cause miscarriage of the second child include chromosomal abnormalities, pathogenic microorganisms in the body, and immune antibodies. Poor semen quality and insufficient female endocrine hormones can also cause miscarriage when women are pregnant with their second child.

After a woman becomes pregnant with her second child, she will experience miscarriage. Many women do not know why their first child was fine, but why did they have a miscarriage with their second child? What factors are involved? Let's take a look at why women with second children may have miscarriages and what factors cause this phenomenon. How can we prevent this harmful phenomenon?
1. Involving chromosomal abnormalities, etc. <br/>Chromosome abnormalities, pathogenic microorganisms, immune antibodies, poor semen quality, insufficient endocrine hormones, etc. can all be causes. The couple can do a check in this regard.
2. Causes of miscarriage in women <br/>Embryonic (or fetal) factors. Abnormal embryonic development is the most common cause of early miscarriage, and miscarriage caused by chromosomal abnormalities accounts for about 50-60%. 2. Placental abnormalities Due to incomplete development of the trophoblast, degeneration of placental villi, or too low a placental attachment, the fetal-placental circulation may be impaired, leading to miscarriage.
Maternal factors. Acute infectious diseases can cause fetal death due to pathogens or toxins invading through the placenta, or uterine contractions caused by high fever or poisoning can lead to miscarriage, severe anemia or heart failure can lead to fetal hypoxia and death. Endocrine disorders, such as corpus luteum insufficiency, can lead to decidua dysplasia and affect the development of fertilized eggs. Uterine dysplasia, uterine fibroids or malformations can also hinder embryonic development. Sometimes, late miscarriage can occur due to relaxation of the internal cervical os that cannot withstand the increased pressure of the fetal gestational sac. Strong mental stimulation, trauma or sexual intercourse can also cause miscarriage, but the common inducing factors are mainly caused by defects in the embryo itself.
3. External factors <br/>Toxic substances that can cause miscarriage include cadmium, lead, organic mercury, DDT and other radioactive substances. These toxic substances may directly act on fetal somatic cells, or they may affect the fetus through the placenta and cause miscarriage.
From the above analysis, we can see that miscarriage of the second child involves many factors, including immune factors, maternal-fetal blood type incompatibility, environmental factors, female chromosomal abnormalities and many other factors. Therefore, when these signs appear, pregnant women must pay attention and take certain preventive measures to avoid harm and ensure a normal delivery.