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Early life is a period during which the development of the human immune system undergoes the most radical and rapid changes. It is clinically characterized by a strikingly elevated risk of infection [1]. The immune system is a crucial player in preventing pathogen invasion. The neonatal period is particularly critical because newbos are immediately exposed to multifarious microorganisms which they never experienced in uterine environment. The high morbidity and mortality resulting from infections during the first months of life are due, among other factors, to significant quantitative and qualitative deficiencies in various components of the immune system [2]. In the last few years, an increasing number of investigators have contributed data describing the ontogeny of the neonatal immune system [3]. In light of these results, the perception of the neonatal immune system as somewhat non-functional should now be re-examined.