The effect of a cold on a pregnant woman’s fetus depends on the extent of the cold, the symptoms it causes, and whether and what kind of medication she is taking. A woman’s resistance decreases after pregnancy and she is very prone to catching a cold. If it is a common cold with symptoms such as sneezing, runny nose, nasal congestion, etc., it can be cured without taking medication, and it will not have any effect on the fetus. It is necessary for pregnant women to keep warm and avoid strenuous exercise to prevent the occurrence of another cold. If you are suffering from a serious cold or influenza that causes fever, weakness, loss of appetite, sore throat, swollen tonsils, etc., it will affect the fetus if you do not take any treatment. In early pregnancy, since the fetal organs are not yet fully developed, bacteria or viruses can pass through the placenta and affect the fetal organ development after a cold; in late pregnancy, the fetus is basically fully developed, but the high fever and toxins from metabolic disorders caused by a cold can stimulate the uterus to contract, which can easily cause premature delivery and increase the mortality rate of newborns. Therefore, it needs to be taken seriously, but the medication should be used reasonably under the guidance of a doctor, do not blindly use medication on your own. Also pay attention to drink more water, pay attention to rest, and avoid strenuous exercise. Therefore, pregnant women must not take medication on their own after catching a cold, and they should pay attention to both the effect of cold on the fetus and the effect of medication on the fetus.