The Harriet Lane Handbook: The Johns Hopkins Hospital (23rd Edition) is a widely trusted, portable reference for pediatric care that provides concise, evidence-based guidance on the diagnosis and management of diseases in infants, children, and adolescents. Developed and regularly updated by residents and faculty at The Johns Hopkins Hospital, it covers a broad range of topics including emergency care, drug dosing, infectious diseases, and subspecialty pediatrics. Known for its quick-reference format and comprehensive pediatric drug formulary, the handbook is an essential resource for medical students, residents, nurses, and clinicians who need fast, accurate information in clinical settings.