Fetal head articulation, also known as fetal head insertion, describes the descent of the fetus toward the maternal pelvis and is one of the requirements for natural vaginal delivery of the fetus. Fetal head articulation means that the biparietal diameter of the fetal head enters the pelvic inlet plane at the time of delivery, and the lowest point of the fetal head’s skull is close to or reaches the level of the sciatic spine, and usually the fetal head enters the pelvic inlet in a semi-pronated state to be articulated by occipitofrontal diameter. Primigravid women tend to articulate within 1-2 weeks before the expected date of labor, and transient women tend to articulate after the onset of labor, but there are individual differences between each woman, and the time of articulation will be relatively different. If the amount of exercise is low, pregnant women will experience fetal head articulation relatively late, and it may not occur until after labor has officially begun. However, if the fetal head still cannot be inserted into the pelvis after labor has officially begun, consider cephalopelvic disproportion, oversized fetus, or maternal pelvic abnormality. If the head of the fetus fails to meet in late pregnancy, you should go to the hospital as soon as possible for examination. It is recommended to check the color ultrasound to find out whether there is umbilical cord around the neck, to find out the size of the biparietal diameter, and to measure the diameter of the pelvis, to see whether the pelvis is too small. If there is cephalopelvic disproportion, cesarean section should be considered.