Why pediatric fluid balance is critical on NCLEX-RN: Children are far more vulnerable to fluid and electrolyte imbalances than adults. A young infant can become significantly dehydrated within hours of illness onset. The RN must accurately assess dehydration severity, select appropriate rehydration strategies, calculate maintenance fluid requirements, and monitor response — all while recognizing when IV fluid resuscitation is urgently needed. Pediatric fluid vulnerability factors: - Higher body water percentage (75% in neonates vs. 60% in adults) - Higher metabolic rate → higher insensible water losses per kg - Larger surface area-to-volume ratio → greater evaporative losses - Immature renal concentrating ability (especially neonates) → less ability to conserve water - Depend entirely on caregivers for fluid intake — cannot self-hydrate Common causes of pediatric dehydration: - Gastroenteritis (most common): vomiting + diarrhea → fluid and electrolyte loss - Fever: increases insensible losses by ~12% per degree above normal - Inadequate intake: poor feeding in illness, refusal, NPO for procedures - DKA (diabetic ketoacidosis): osmotic diuresis - Heat illness On the exam, writers often pair stable-sounding options with unstable data—notice...