Treatment of Diarrhea in Children

Initial Assessment and Rehydration

The American Academy of Pediatrics recommends rapid assessment of hydration status by examining skin turgor, mucous membranes, mental status, pulse, and capillary refill time, as well as weight loss, which is the most reliable clinical indicator of dehydration 2
Dehydration severity can be classified as mild (3-5% fluid deficit), moderate (6-9% fluid deficit), or severe (≥10% fluid deficit, shock, or pre-shock) 2, 3

For mild dehydration (3-5% deficit), administer 50 mL/kg of reduced osmolarity oral rehydration solution (ORS) over 2-4 hours, as recommended by the World Health Organization 1, 2
For moderate dehydration (6-9% deficit), administer 100 mL/kg of ORS over 2-4 hours 1, 2
For severe dehydration, immediately initiate IV rehydration with 20 mL/kg boluses of Ringer's lactate or normal saline until pulse, perfusion, and mental status normalize, then transition to ORS 1, 2

The American Academy of Pediatrics recommends continuing breastfeeding on demand throughout the entire diarrheal episode without interruption, as breast milk provides essential nutrients and helps prevent dehydration 1, 2, 4
For formula-fed children, resume full-strength formula immediately upon rehydration, without diluting the formula 2, 4
The European Society for Pediatric Gastroenterology, Hepatology, and Nutrition recommends resuming age-appropriate diet during or immediately after rehydration is completed, including starches, cereals, yogurt, fruits, and vegetables 1, 3, 4

The World Health Organization recommends administering oral zinc supplementation to reduce the duration of diarrhea in children aged 6 months to 5 years, particularly those with signs of malnutrition 1, 2, 3

The FDA contraindicates loperamide in children under 2 years due to risks of respiratory depression and serious cardiac adverse reactions, and the American Academy of Pediatrics recommends avoiding antimotility agents in any child under 18 years 1, 3
Ondansetron is not recommended for children under 4 years of age, as recommended by the American Academy of Pediatrics 1, 2

Reassess hydration status after 2-4 hours of rehydration, and if the child remains dehydrated, reassess the fluid deficit and restart the rehydration protocol, as recommended by the American Academy of Pediatrics 2, 3