Micro-examination mainly checks whether the fetus has any defects or malformation development, etc.. Micro-anomaly examination belongs to an important examination in the maternity checkup program, usually around the third month of pregnancy to do four-dimensional ultrasound examination, mainly to check whether there are fetal defects or malformations in development, such as spina bifida, anencephaly, congenital heart disease, osteogenesis imperfecta, as well as the development of the urinary system, the reproductive system abnormalities, and so on. Once abnormal development or malformation of the fetus is detected, the pregnancy should be terminated promptly. After pregnancy, in order to ensure the birth of a healthy baby in full term, women must go to the obstetrics or gynecology department of a regular hospital for regular obstetrics and gynecological examinations, including major and minor aberration examinations, to timely detect fetal malformations and other abnormal development. If, after scientific medical examination and clear diagnosis by the doctor, it is determined that the fetus has developmental abnormalities, it is recommended to cooperate with the doctor to terminate the pregnancy as soon as possible in order to avoid giving birth to a deformed baby.