If a pregnant mother is in a bad mood, it may affect the fetus. The mood of a pregnant mother can have a very important impact on the growth and development of the fetus. If a pregnant woman is in a state of chronic stress, anxiety or depression during pregnancy, it may affect the oxygen level in her body and even fetal hypoxia, which may affect the growth and development of the fetus. In addition, studies have shown that abnormal emotions during pregnancy may also lead to fetal developmental malformations, such as the occurrence of external ear malformations. It has also been reported in the literature that the emotional state of the mother during pregnancy may affect the formation of the fetus’ personality as an adult. It is recommended that pregnant mothers should take care to keep their moods relaxed during pregnancy for a happy and healthy pregnancy.