A cold in the third trimester of pregnancy does not normally cause fetal malformations. After a cold in the third trimester, it is difficult for the cold virus to pass through the placental barrier into the fetus, and even if it does, it is very difficult to cause fetal malformation. There are many reasons for fetal malformation, most of which are developmental problems of the fetus itself. Exposure to intense rays or toxic substances can sometimes increase the incidence of malformations. The first trimester of pregnancy is the most important time for the formation of fetal organs. If a pregnant woman catches a cold in the first trimester, as long as the symptoms are not serious, mild coughing, sneezing and other minor symptoms, she can recover from it by keeping warm in her daily life, resting, and drinking plenty of boiled water. If the cold symptoms are too serious, must be under the guidance of the doctor symptomatic medication, but can not use drugs prohibited during pregnancy, so as not to affect the normal development of the fetus caused by malformation. When a pregnant woman has a cold in the first trimester of pregnancy, it is recommended to go to the hospital in a timely manner, diagnosed and treated by a professional doctor, and not to use medication privately to prevent adverse effects on the fetus.