The stabbing pain at the bottom of the abdomen at 29 weeks of pregnancy may be caused by the tightness of the uterine wall due to the enlargement of the fetus, or the enlarged uterus touching the pubic symphysis and squeezing the bladder, causing stabbing pain at the bottom of the abdomen, which is usually normal and can be observed temporarily. Usually the pain lasts for a relatively short time and can improve after rest. If the stabbing pain at the bottom of the abdomen persists or worsens at 29 weeks of pregnancy, accompanied by vaginal bleeding and other conditions, you should go to the hospital in a timely manner and have a fetal 3D ultrasound, fetal heart monitoring and other examinations to observe whether contractions have occurred and whether there is a risk of preterm delivery, and pay attention to the condition of the placenta and fetus. At 29 weeks of pregnancy, if you experience persistent tingling at the base of the abdomen, you should go to the hospital for a fetal 3D ultrasound in time. The most common cause may be the presence of contractions and a fetal heart monitoring test is recommended. If the pain is caused by more regular contractions and the mother is at risk of preterm labor, hospitalization is recommended for fetal preservation treatment. It is necessary to apply magnesium sulfate intravenously or orally as prescribed by the doctor to suppress contractions, and dexamethasone to promote fetal lung maturation. It is also important to pay attention to the condition of the placenta, whether it is hypoplastic or abruptio placenta, which often results in vaginal bleeding. During the ultrasound, the length of the cervix can be measured. If the length of the cervix is less than 2.5 cm, the risk of preterm labor is indicated and hospitalization is recommended. If the length of the cervix is greater than 2.5 cm, the risk of preterm labor is generally considered to be low and the baby can be temporarily kept at home. During the process of labor preservation, it is recommended that the pregnant woman should lie on her left side, take oxygen appropriately, and pay attention to monitoring contractions.