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Fetal growth retardation, also known as miscarriage, refers to the phenomenon of spontaneous abortion when the embryo or fetus stops developing or dies in the early stages of pregnancy. This situation often causes frustration and heartache for patients and families. Knowing some common causes of fetal growth retardation can help people better understand and deal with this problem.

1. Chromosomal abnormalities

Chromosomal abnormalities are one of the most common causes of fetal growth retardation. These abnormalities may be due to errors in the division of chromosomes during embryonic development. Chromosomal abnormalities may come from one or both parents, or they may occur randomly.

2. Immune system problems

Sometimes, an abnormal response of the immune system may cause the embryo to be rejected as a foreign body, leading to fetal arrest. Immune system problems may cause an inappropriate immune response that attacks the embryo's tissues.

3. Abnormal uterine structure

Structural abnormalities of the uterus, such as endometrial abnormalities, uterine septum or uterine septum, may affect the implantation and development of the embryo and lead to fetal growth retardation.

4. Abnormal hormone levels

Hormones play an important role in pregnancy, especially progesterone, estrogen and progesterone. If the levels of these hormones are unbalanced or abnormal, it may affect the development of the embryo and the maintenance of pregnancy.