Introduction: Anemia is the reduction of normal number of red bloods cells and quantity of hemoglobin in blood. The level of hemoglobin in the blood is widely accepted as the method for diagnosing anemia. Various hemoglobin values have been proposed for the diagnosis of anemia in pregnancy. Anemia in pregnancy is defined by WHO as a hemoglobin concentration below 11 g/dL.1 However, the CDC suggests a hemoglobin level of 11 g/dL in the first and third trimesters and 10.5 g/dL in the second trimester as cut-off values for anemia.7 The definition proposed by WHO is most commonly used. classification of anemia is based on etiology, red blood cell form or shape, and duration of disease. A clinically useful classification of anemia based on hemoglobin level.Material and method: search in Ovid and other electronic reverences.Results : The most common risk factors for the development of IDA in pregnancy include vegetarian diet, menstrual abnormalities prior to pregnancy, minority status, level of education sixth grade or less, high parity (risk increases three-fold in women with two to three children as opposed to nulliparous women), hyperemesis gravidarum, and poverty-level income. In a normal gestation, the total iron requirement throughout the pregnancy is approximately 1 g. Approximately 300 mg are actively transferred to the fetus and placenta, 200 mg are lost to various routes of excretion, and approximately 500 mg are incorporated (if available) into the increasing maternal hemoglobin mass. Erythropoiesis increases progressively with gestational age and returns to normal 5 weeks after delivery.Conclusion: There is an uneven distribution of iron requirements during pregnancy. Because of the absence of menstrual losses and negligible needs of the fetus, iron requirements in the first trimester are very low. Increasing amounts of iron are used during the second half of pregnancy (6–7 mg per day), and the requirement for iron is highest in the third trimester—up to 10 mg per day during the last 6 to 8 weeks of pregnancy.Special attention should be given to teen pregnancies, since the body must meet the gestational requirements in addition to the needs of the growing mother. Particularly significant is the stage of the growth spurt in adolescence when iron requirements are the highest. For example, in 14-year-old girls, median iron requirements can be approximately 30% higher than that for their mothers.