It contains more than 160 of major topics that discuss the most important and most common topics in neonatology and pediatrics which are frequently encountered in hospitals and clinics. This book can benefit undergraduate and postgraduate students as well as specialists in the field of Pediatrics. It is derived from the famous book "Nelson Textbook of Pediatrics" and the fifth edition of the book is updated according to the last edition of the textbook (21st edition / 2019)