A 3-year-old child has been experiencing severe diarrhea for 3 days with signs of moderate dehydration: decreased skin turgor, dry mucous membranes, and decreased urine output. The parents ask about fluid management. What is the most appropriate initial nursing intervention?

First-Line Therapy: Oral rehydration solution (ORS) is the cornerstone of treatment for mild to moderate dehydration in children with acute diarrhea. The World Health Organization (WHO) and CDC recommend standard osmolarity ORS (e.g., 245 mOsm/L) with a specific glucose-to-sodium ratio to optimize the SGLT1 cotransport mechanism.

Administration Protocol: For moderate dehydration, administer 50–100 mL/kg of ORS over 2–4 hours. Use a teaspoon, syringe, or dropper to give small, frequent volumes (e.g., 5 mL every 1–2 minutes) if the child is vomiting. Reassess hydration status hourly.

Fluids to Avoid: Do not use apple juice, soda, sports drinks, or plain water. These are hyperosmolar or lack adequate sodium, potentially worsening hyponatremia and osmotic diarrhea. Milk-based products may cause transient lactose malabsorption and should be reintroduced cautiously after rehydration.

Nutritional Support: Continue breastfeeding or age-appropriate feeding as soon as the child is rehydrated. Early refeeding with complex carbohydrates, lean proteins, and yogurt helps restore enterocyte function and reduces illness duration.

Monitoring Parameters: Track strict intake and output, daily weight, urine specific gravity, and clinical signs (skin turgor, mucous membranes, mental status). Return to emergency care if the child develops severe dehydration, altered consciousness, or intractable vomiting.