The occurrence of natural miscarriage is somewhat related to the quality of the male's sperm. When the vitality of the sperm and the rate of sperm abnormalities are both decreased, it tends to lead to miscarriage. The combination of sperm and egg requires both to be healthy to conceive a healthy baby. If the quality of the sperm is poor, it might lead to miscarriage even if a fertilized egg is formed. Therefore, before pregnancy, both men and women should go to the hospital for pre-pregnancy check-ups to see if their bodies are suitable for pregnancy. If the sperm quality is poor, it should be regulated, and pregnancy should only be attempted after the sperm quality has been improved.