Sperm malformation is a possible cause of fetal arrest, although a woman is pregnant, it is very dangerous in the first trimester of pregnancy and can easily cause the embryonic tissue to stop developing. The main reason for this is that when the sperm and the fertilized egg unite, the quality of the sperm is not exactly normal, usually weak sperm, low sperm, dead sperm and poor sperm motility can lead to fetal arrest. If a man has sperm malformation it is recommended that he must pay attention to his usual habits, he should not smoke or drink alcohol, he should take rest and have regular meals and stay up less late. Problems with sperm must be checked for endocrine abnormalities, seminal vesicles, prostatitis and other diseases as well as chromosomal abnormalities.Semen test can be used to know the quality of semen. If you are preparing for pregnancy, it is recommended that both men and women need to be checked and clarified at the same time before you can get pregnant.