A guide for scientists, pediatricians and students involved in metabolic studies in pediatric research • Addresses the availability of modern analytical techniques and how to apply these techniques in metabolic studies • Covers the whole range of available mass spectrometric techniques used for metabolic studies including Stable Isotope Methodology • Presents the relevance of mass spectrometry and stable isotope methodology in pediatric research covering applications in Nutrition, Obesity, Metabolic Disorders, and Kidney Disorders • Focuses on the interactions between nutrients and the endogenous metabolism within the body and how these factors affect the health of a growing infant.