This book review, educate and provide guideline for every parent and caregiver to calculate the physiologic stomach size to provide proper growth, hydration, nutrition and preventing: gastroesophageal reflux, vomiting, colic, acute life-threatening event and sudden infant death by overfeeding reflux. This book is the work from a pediatric gastroenterologist with over 20 year of experience in this field and providing continue care for healthy, outpatient infant sick, hospitalized in pediatric units, pediatric intensive care unit and neonatal intensive care unit/nursery in multiple hospitals with excellent success caring for his patients and minimizing the use of unnecessary formulas and medications and preventing unnecessary emergency room visit, hospitalization or medical test or procedures.