The absence of fetal heart in a child may be caused by too early examination, chromosomal abnormality, environmental factors and endocrine factors. 1. Examination too early: after pregnancy, before the fetal heart is fully formed, medical examination, examination time is too early, it will be found that there is no fetal heart. 2. Chromosomal abnormality: In the process of pregnancy, the chromosomal abnormality of the embryo will easily lead to the absence of fetal heart. 3. Environmental factors: Frequent exposure to toxic and radioactive substances and excessive stimulation before and after pregnancy may lead to the absence of fetal heartbeat and stop the development of the fetus. 4. Endocrine factors: for example, luteal insufficiency, resulting in low levels of progesterone in the body, which may not be conducive to the development of the embryo, leading to the absence of fetal heartbeat. If your child does not have a fetal heartbeat, you should undergo further examination to clarify the causative factors and treat accordingly under the guidance of your doctor.