The effect of upper respiratory tract infection on the fetus of pregnant women is manifested in the following aspects: 1. The symptoms are mild, the pregnant woman has no fever or mild fever, and the body temperature is below 38℃. Pregnant women may have symptoms of nasal congestion, runny nose and throat discomfort, which have no effect on pregnant women and fetus at this time and do not require treatment, and can be treated symptomatically at home; 2. Pregnant women’s body temperature is above 38℃, and high fever will affect the fetus, which can lead to fetal malformation, abnormal development of fetal neural tube, congenital heart disease and other adverse consequences. At this time, drug intervention is required. According to the drug classification of the FDA, after the third trimester of pregnancy, Class A or B drugs can be chosen to reduce fever, followed by adequate hydration to prevent complications, while avoiding the choice of Class C or D drugs. Please combine the specific medication with the clinic and be guided by the doctor’s face-to-face consultation.