Causes of embryonic arrest: Embryo arrest is when the fertilized egg suddenly stops developing, eventually leading to death or spontaneous abortion. In most cases, this situation is caused by some undesirable factors. Let\’s analyze it in detail from several aspects. Genetic factors Genetic factors are one of the most important reasons why an embryo stops developing. This mainly refers to spontaneous chromosomal abnormalities in embryos, such as trisomy, tetrasomy or chromosome breakage. Such anomalies often occur