Weak fluctuations in fetal heartbeat monitoring at 35 weeks may be related to fetal hypoxia. 35 weeks already belongs to the late stage of pregnancy, the appearance of weak fluctuation of fetal heartbeat monitoring is usually related to fetal hypoxia, and the cause of this situation is usually caused by maternal hypoxia, umbilical cord torsion, kinking, the mother’s own comorbidities and the congenital development of the fetus, and so on. The purpose of fetal heart monitoring during late pregnancy checkups is to see if there is a possibility of fetal hypoxia, and the interpretation of the specific results should be carried out by a specialized physician. Pregnant women should go to the hospital for regular checkups in late pregnancy, and if there are weak fluctuations in the fetal heartbeat, it is recommended that the cause of the problem be clarified and treatment be provided under the guidance of a doctor.