The birth weight of an infant is the single most important determinant of its chances of survival healthy growth and development. Because birth weight is conditioned by the health and nutritional status of the mother, the proportion of infants born with low birth weights (LBW) closely reflects the health status of the communities into which they are born.It is clear from the many causes that there is no single line of management to LBW. Prenatal care, nutritional programs, health education on the need of pregnant women, family planning, and measures aimed at improving the health and nutrition of young girls affect the management. We have reported the incidence of LBW among babies born in Zagazig University Hospitals with predominancy to prematurely born infants (81%).The highest incidence is among the group of low birth weight between 1.500 and 2.5000 kg. (52.2%). There is no relation between birth weight and the gender of the baby. The gestational age of LBW babies ranged between 27 & 40 weeks, while the gestational age of normal birth weight babies was ranged between 37 and 40 wks. The incidence was high among multiple pregnancies (either twin or triplets).