It is inaccurate to say that the first child is prone to miscarriage; first-trimester miscarriage is not a common occurrence, but a minority one. The causes of miscarriage are many, mostly related to the abnormalities of male sperm, abnormalities of female uterus or reproductive tract, female comorbidities, easy embolism and so on. 1. Abnormalities of male sperm: If the male sperm has abnormalities such as deformities or poor motility, it will also easily lead to miscarriage. 2. Abnormalities of the female uterus or reproductive tract: If a woman has uterus-related diseases such as endometriosis or abnormalities of the reproductive tract, it will also affect the development of the embryo and thus miscarriage will occur. 3. Women with comorbidities: If a woman has a combination of coagulation disorders, endocrine disorders, such as diabetes or hypothyroidism, it can also cause miscarriage. 4. Easy thrombosis: This leads to an increased likelihood of blood clots forming in the tiny blood vessels of the placenta, which can also lead to early miscarriage. Most people are able to have a successful pregnancy without miscarriage even if it is their first child. If recurrent miscarriage occurs, you should seek medical attention to identify the cause of the problem before pregnancy and then continue with the next pregnancy.