The body of a pregnant woman will show corresponding changes after pregnancy. The immunity of a pregnant woman after pregnancy will indeed be reduced, and the body will undergo great changes after pregnancy. First of all, the respiratory system, after pregnancy is affected by estrogen, the mucous membrane of the respiratory tract will be significantly thickened with congestion and edema, which will easily lead to respiratory tract infections. Secondly, the gums will also become hypertrophied after pregnancy, the probability of gingival inflammation during pregnancy will also increase, the uterus after pregnancy will compress the kidneys to cause pyelonephrosis, coupled with the urethra and vagina are very close to each other will also increase the symptoms of urinary tract infections. During pregnancy, pregnant women should pay attention to self-protection, pay attention to hygiene, and try to avoid getting cold, because there are risks associated with the use of medication during pregnancy, and it is important to be physically healthy in order to minimize the impact on the baby.