In some women, an ultrasound after pregnancy reveals a gestational sac but no fetal heart and germ, a condition that indicates that the gestational sac has stopped developing. The causes of this phenomenon are multifaceted and include a series of reasons such as decreased maternal immune function, endocrine disorders, intrauterine infection, too thin endometrium, chromosomal abnormalities, etc. Chromosomal abnormalities are the main cause of embryonic abortion. If embryonic abortion occurs and you wish to know the cause, you must remember to send embryonic tissue for chromosomal or genetic examination, and if you find one more chromosome, one less chromosome, or one more set of chromosomes, then it is clear that such embryos will not survive and have little to do with maternal illness. Secondly, maternal endocrine abnormalities are also common causes, such as polycystic ovary syndrome, luteal hypofunction, uncontrolled diabetes, hypothyroidism, hyperthyroidism, etc. In addition, immune function is the main factor affecting the production of fetal heart and fetal buds, if the mother’s own immune function is abnormal, it is also difficult to maintain the normal development of the embryo. In addition to this, there are severe intrauterine infections that destroy the environment for the survival of the gestational sac, and repeated uterine cleanings that cause endometrial adhesions or are too thin, which also do not provide sufficient nutrients for the gestational sac to maintain its development, which can also lead to the absence of the fetal heart and germ. In addition, if the male chromosomal abnormality causes poor sperm quality or the fertilized egg has certain defects, there will also be no fetal bud and fetal heart, so the reasons for the absence of fetal heart and germ are multiple.