A low lying fetus is not a placenta praevia. 1. Fetal position is low: the position of the fetus in the mother’s uterus is relatively low, more obvious stomach. There is also a phenomenon clinically known as pendulous abdomen, pregnant women’s abdomen swells forward and downward, due to cephalopelvic disproportion, maternal pelvic anomalies, pelvic stenosis, the fetus is not suitable for pelvic, even if the pelvis is not easy to give birth, which will easily lead to excessive abdominal distension. 2. Placenta praevia: This is a kind of abnormal state of placenta, which refers to the position of placenta in the uterus after 28 weeks of pregnancy is lower than the prenatal part of the fetus, and it attaches itself to the lower part of the uterus, and even the placenta reaches or covers the inner cervical os of the uterine cervix, which may cause painless vaginal bleeding. In addition, whether it is self-conscious low fetal position or placenta previa, it is recommended that women need to actively undergo examination and treatment to rule out abnormalities, usually regular pregnancy checkups, self-calculation of fetal movement, and the emergence of abnormalities in a timely manner to seek medical attention.