Abstract Introduction: Postpurtum period begins after delivery, this period takes 6 weeks existing deciduas of uterus caused red vaginal discharge. Acording to present resorces if this discharg continued over 2 weeks it would be patologic. Different studies have shown different duration in Postpourtun hemorrage. Objective: The main aim of this research was to determine a lochia pattern and some factors which influence its period length , and to find, the relation between variables such as the number of pregnancies , the birth weight and frequency of breast feeding with the lochia time length . Materials and Methods: In this descriptive – analytic research, 200 cases of nuliparous and multiparous with ntural labor , selected randomly. For collecting data were used an information form and standard jackebson form for determination of the lochia time length. The data were analyzed by using regression and survival Koplen – Mair analysis . Results: It showed the number of pregnancies had a significant relation with the lochia duration (P < 0.01). More number pregnancies, caused less lochia duration. Also more birth weight, caused more lochia duration (p< 0.01) and the frequency of lactation, caused less lochia duration (P < 0.01) . Conclusion: Increased lochia duration was not unusual and lactation reduced strongly lochia duration

Keywords: Post partum Hemorrhage, Puer perium, Lactation

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