This book is intended to provide guides to the evaluation and management of common infectious conditions in the newborn period. The spectrum of the book covers neonatal infectious conditions which non-specialist medical practitioners may encounter in their clinical practices in the different parts of the world. The approach in this book focuses on specific characteristics of these infectious conditions in order to facilitate clinical assessment. To arrive at this point, the book is synthesized from several published scientific facts about each of the newborn infections mentioned in the book. The scope of the book covers a description of the content and functions of the immune system in the newborn highlighting its peculiarities and comparing it with the immune system of the older child.