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Studies undertaken by the National Institute of Nutrition during the last 10 years indicate that prolonged breast-feeding is still the rule among rural and urban low income group population in Hyderabad. Lactation induced hyperprolactinaemia prolongs postpartum amenorrhea and inter pregnancy interval by about 6 months. Duration of lactational amenorrhea infants results in a fall of plasma prolactin levels and rapid return of menstruation and fertility. Lactational amenorrhea lasts longer in undernourished women with low body weight and low fat fold rural women, duration of lactational amenorrhea is longer as compared to urban women. This might be partly attributable to the delay in introduction of supplements to the rural infants and partly to the lower body weight and fat fold thickness of rural women.