There is no clear standard for how long the cervical canal can be kept in labor at 29 weeks, but it is generally related to one’s own condition, and the amount of time that can be kept in labor varies among different groups of people. The probability of the cervical canal disappearing at 29 weeks of pregnancy is relatively small, at this stage should be hospitalized for observation, if the cervix completely degenerates or contractions occur in the mother will usually appear in a very short period of time signs of preterm labor, the condition of the pregnant woman may vary, the duration of time for which the pregnancy can be preserved will also vary. Patients are advised to pay close attention to the vital signs and fetal heartbeat after the cervical canal disappears, and to intervene promptly when problems are detected, so as to avoid delaying the disease. If the cervical canal disappears at 29 weeks, it is recommended to consult a doctor to identify the cause of the problem and provide targeted treatment or therapy.