Urinary tract infections (UTI) are the most common infections during pregnancy. It’s ‘caused by physiological changes which are going on in pregnant women body. In this study there was examinated a frequency of uterin’s tract infections at pregnant women with diabetes. It has been indicated , that this is infection which in significant way complicate the pregnancy, especially at patients with diabetes type G1, which doesn’t need insulin treatment. The most common pathogenic factor is E. coli, which can be successfully treatment by Ampicillin. However, uterin’s tract infections doesn’t have any influence on general condition of newborn children.