The fetus is fully developed in the fourth month of pregnancy, so if the cold is not particularly serious, it will not affect the fetus. If you have a cold in the fourth month of pregnancy, you can drink moderate amount of Chinese medicine preparations, such as Jin Yin Hua granules or cold spirit punch. This medicine can treat the symptoms of runny nose, sneezing or nasal congestion caused by cold, and has the effect of clearing heat, detoxifying and dispelling fire. Pay attention to keeping warm, drink more warm water, take rest and eat lightly to promote quick recovery from cold. If the symptoms of mild fever appear, you can drink Qing Kai Ling Oral Liquid or Xiao Chai Hu Granules, which also belong to traditional Chinese medicine preparations. If the cold is not particularly serious during pregnancy, it is not recommended to treat it with medicine, and it is better to improve the symptoms through the usual diet and daily living habits.