After a woman has been determined to be pregnant, it is necessary to carry out various obstetric examinations on the fetus in the belly in a timely manner, many people will choose to do some color ultrasound, then do color ultrasound fetal stop actually did not stop may be related to the following factors: 1, the accuracy of the ultrasound efficiency is very high, but is not 100% accurate, this situation may occasionally exist, and the detection of personnel technology, instrumentation, the time of the examination, the This situation may occasionally exist, and is related to the technology of the testing personnel, the equipment, the time of the examination, the body position of the examination, etc. It is recommended to review the ultrasound regularly to understand the development of the fetus. 2, in the early stages of pregnancy, if the luteal function of the young mother is not sufficient, to timely conditioning, otherwise it is easy to cause the emergence of this situation, you can eat some progesterone supplementation drugs, such as progesterone, under the guidance of the doctor to regulate. 3, when the body of the female thyroid function has been abnormal, it is likely to lead to the embryo in the belly, the phenomenon of stopping growth, so once detected fetal arrest, it is recommended to do further blood tests. 4, some people because of congenital abnormal development of the uterus, it is likely to cause the fetus to stop growing, so it is necessary to make a clear diagnosis in a timely manner. Women do ultrasound during pregnancy fetal arrest and actually did not stop, is caused by a variety of reasons, according to their own situation, to make the appropriate conditioning and treatment.