Diabetes mellitus (DM) is a metabolic disorder characterized by hyperglycemia caused by insulin deficiency or insulin resistance. DM in pregnancy is divided into two groups: pregestational and gestational diabetes. The prevalence of diabetes is rapidly increasing worldwide, which can lead to both maternal and fetal complications in pregnant women. The main goal in diabetes management is to have a healthy pregnancy and a healthy baby. Midwives should guide women in the risk group to have regular glucose measurements and support glycemic control before pregnancy planning. Those on oral antidiabetics should be advised to switch to insulin and have their eye and kidney function assessed. Glycemic control, regular monitoring and appropriate tests (HbA1C, glucose screening test, OGTT) should be performed depending on changes in insulin resistance during pregnancy. The midwife should counsel the pregnant woman on diet, exercise, insulin administration, glucose measurement techniques, stress management, fetal movement monitoring and hygiene. Emergency intervention protocols in cases of hyperglycemia or hypoglycemia should be explained. Blood glucose should be monitored regularly during labor and glucose level should be controlled with insulin and glucose infusions. Infection, bleeding and fluid-electrolyte balance should be closely monitored. The need for insulin decreases after delivery, but glucose tolerance problems may develop. Breastfeeding counseling should be given to the mother and precautions should be taken against neonatal hypoglycemia. Necessary follow-up should be done in terms of postpartum complications, infections and neonatal care. In conclusion, individualized care provided by a multidisciplinary team in pregnant women with diabetes is vital to prevent possible complications and promote positive pregnancy outcomes.