Fever in pregnant women in early pregnancy can lead to fetal malformations. Because research has proved that during pregnancy if a pregnant woman has a fever, especially a high fever, the effect on the fetus is more obvious, and the incidence of fetal malformations will appear significantly higher. However, a body temperature of 38 degrees Celsius will not have a great impact, it may be caused by a cold, and if the body temperature can be reduced to normal soon, it will not have a great impact on the fetus. There are many reasons for abnormal fetal development, and sometimes it is impossible to find out, so try not to go to public places in the early stages of pregnancy to avoid fever caused by a cold.