The third trimester of pregnancy for senior pregnant women does not mean that they are stable. Pregnant women of advanced age are at a higher risk than ordinary pregnant women throughout their pregnancy. In the first trimester of pregnancy, there may be premature miscarriages and embryonic arrest due to chromosomal abnormalities in the embryo, maternal luteal insufficiency, and external stimuli. The quality of eggs in advanced maternal age is not as high as that of women of the right age and is more prone to abnormalities. The risk of pregnancy complications such as hypertensive disorders of pregnancy and gestational diabetes mellitus increases during the middle and late stages of pregnancy, and the chances of pregnant women having placenta praevia, placental abruption, etc. also increase, so even if there is no abnormality in the first trimester of pregnancy for an elderly pregnant woman, it does not mean that she will be stable after that. Pregnant women of advanced age should pay more attention to their own health, pay attention to regular obstetric examinations, and seek medical treatment in time if there is any abnormality.