Diseases experienced in normal time can of course also occur in pregnancy. One of them is infection. Infectious diseases are quite diverse. These can be caused by bacterial cases, viruses, microorganisms such as parasites. In pregnancy, some of these risks do not pose a serious risk to the baby, while some of them can be. For example, cystitis, or so-called urinary tract infection, respiratory tract infections, influenza, cough, catarrh, diarrhea, fungal diseases, if not severe, does not affect the unborn baby. They can be removed from the body with medications recommended by doctors without side effects. However, there are some types of infections that, although not normally a serious problem, can pose a threat to pregnant women and their babies. The main types of this disease are vaginal infection called vaginosis, pyelonephritis and infection affecting the kidneys from the urinary tract, rubella, chicken pox and toxoplasmosis. These infections may affect the fetus side during pregnancy and may cause congenital anomalies. In case of high fever, weakness or similar conditions, the expectant mother should immediately consult a doctor. According to the results of the examination, the treatment should be carried out meticulously. Before reaching these stages, the mother should avoid the hygiene in her own environment very often. This includes everything from eating and breathing air to clean and reliable genital cleaning. However, in cases where the infection cannot be prevented, it is vital to immediately consult the specialist to understand the severity of the illness, to take some preventive vaccination, to take action for treatment and not to endanger the health of the mother and the baby.