A 2-year-old child is admitted to the pediatric unit with severe diarrhea and dehydration. The child has had 8-10 watery stools in the past 24 hours and shows signs of moderate dehydration. The parents report the child has been refusing solid foods but will take small sips of water. What is the most appropriate initial nursing intervention?

For a child with acute watery diarrhea, rapidly classify dehydration status using the WHO's Integrated Management of Childhood Illness (IMCI) criteria. Look for key signs: general appearance (lethargy/irritability), sunken eyes, skin turgor (pinch test returns slowly or very slowly), and drinking behavior (drinks eagerly or poorly). A child with 8-10 watery stools in 24 hours and signs of moderate dehydration requires immediate intervention. Document accurate intake and output, including weighing the child to establish a baseline for fluid deficit calculation (1 kg of acute weight loss ≈ 1 L of fluid loss).

The priority intervention is administering standard low-osmolarity Oral Rehydration Solution (ORS) such as WHO-ORS. For moderate dehydration, administer 75-100 mL/kg of ORS over 4 hours. Use a syringe, spoon, or dropper to give small, frequent sips (e.g., 5 mL every 1-2 minutes) to minimize vomiting risk. If the child vomits, wait 5-10 minutes and resume at a slower rate. Continue breastfeeding or formula feeding without interruption. The sodium-glucose cotransport mechanism remains functional, making ORS highly effective even during ongoing diarrhea.

Avoid giving clear liquids like apple juice, sports drinks, or soda. These have high osmolality and inappropriate glucose-to-sodium ratios, which can exacerbate osmotic diarrhea and cause hyponatremia. The BRAT diet is no longer recommended as it is nutritionally inadequate and does not shorten the illness course. Once rehydration is complete and vomiting subsides, resume an age-appropriate, unrestricted diet to provide necessary nutrients for gut mucosal repair. Do not withhold food; early feeding reduces intestinal permeability and diarrhea duration.

Reassess dehydration status hourly during the rehydration phase. Monitor for signs of improvement: increased urine output, improved skin turgor, moist mucous membranes, and return to normal behavior. If the child cannot tolerate ORS due to persistent vomiting, altered mental status, or if signs of severe dehydration develop (lethargy, inability to drink, very slow skin pinch), transition to intravenous fluids with isotonic crystalloids (e.g., Ringer's Lactate) and consider nasogastric tube placement as a bridge. Strictly monitor for electrolyte imbalances, particularly hypernatremia or hypokalemia, in severe cases.