Left lateral wall does not refer to the fetal position, but to the attachment of the placenta to the left wall of the mother’s uterus. The left lateral wall of the placenta refers to the attachment of the placenta to the left wall of the mother’s uterus. The placenta is the link between the fetus and the mother, which provides nutrients for fetal development, expels metabolic wastes, and also functions as a barrier defense. The uterus is the place where the embryo and fetus develop and grow, and is shaped like a resulting pear, a muscular organ with a cavity. There are anterior, posterior, left side, right side wall and the bottom of the uterus. And the fetal position generally refers to the relationship between the prenatal part of the fetus and the mother’s pelvis, mainly cephalic position, breech position. Cephalic position refers to the fetus head down and buttocks up; breech position refers to the fetus buttocks down and head up, and generally cephalic position is easier for smooth labor. Fetal position is not fixed and may change with fetal activity. Therefore, the left side wall is not a fetal position, and there can be various fetal positions when the placenta is attached to the left side wall.