Management of a 15-Month-Old with Acute Diarrhea and Vomiting
Begin oral rehydration solution (ORS) immediately using small, frequent volumes (5 mL every 1-2 minutes via spoon or syringe), assess hydration status to determine severity, and continue breastfeeding or resume full-strength formula once rehydrated. 1, 2
Immediate Assessment of Hydration Status
Rapidly evaluate the child's hydration severity by examining:
- Capillary refill time (most reliable predictor in this age group) 3
- Skin turgor (pinch test for tenting) 2, 3
- Mucous membranes (dry vs moist) 2
- Mental status (alert vs lethargic) 1, 2
- Pulse quality 1
Classify dehydration severity:
- Mild (3-5% deficit): Increased thirst, slightly dry mucous membranes 2, 3
- Moderate (6-9% deficit): Loss of skin turgor, dry mucous membranes, decreased urine output 2, 3
- Severe (≥10% deficit): Severe lethargy, prolonged skin tenting >2 seconds, cool extremities with poor perfusion, rapid deep breathing 3
Rehydration Protocol Based on Severity
For Mild Dehydration (Most Likely in This Case)
- Administer 50 mL/kg of ORS over 2-4 hours 1, 2
- Use commercially available low-osmolarity ORS such as Pedialyte, CeraLyte, or Enfalac Lytren 1
- Do NOT use apple juice, Gatorade, or soft drinks as they contain inadequate sodium and excessive osmolality that worsens diarrhea 1, 3, 4
For Moderate Dehydration
- Administer 100 mL/kg of ORS over 2-4 hours 1, 2
- Consider nasogastric administration if oral intake fails 1
For Severe Dehydration (Emergency)
- Immediately administer 20 mL/kg IV boluses of Ringer's lactate or normal saline until pulse, perfusion, and mental status normalize 1, 2
- This requires immediate emergency department evaluation 3
Managing the Vomiting
The key pitfall is allowing a thirsty child to drink large volumes rapidly, which triggers more vomiting. 5
- Administer 5 mL of ORS every 1-2 minutes using a spoon or syringe 5, 2
- Gradually increase the amount as tolerated 5, 2
- Close supervision is essential to ensure slow, controlled intake 5
- Vomiting often decreases as dehydration is corrected 5
- If persistent vomiting prevents adequate intake, consider continuous slow nasogastric infusion 5
Replacing Ongoing Losses
After initial rehydration, replace continuing losses:
- 10 mL/kg of ORS for each watery stool 2, 3
- 2 mL/kg of ORS for each vomiting episode 2, 3
- Continue this replacement until diarrhea and vomiting resolve 2
Nutritional Management
Resume feeding immediately upon rehydration—there is no benefit to "bowel rest." 5, 3
- If breastfed: Continue breastfeeding on demand throughout the entire episode without any interruption 2, 3
- If formula-fed: Resume full-strength formula immediately after rehydration (lactose-containing formula is tolerated in most cases) 1, 2
- Offer age-appropriate foods including starches, cereals, yogurt, fruits, and vegetables 5, 2
- Avoid foods high in simple sugars and fats 5, 3
Medications: What NOT to Use
Critical contraindications in this age group:
- Antimotility drugs (loperamide) are ABSOLUTELY CONTRAINDICATED in all children under 18 years due to risks of respiratory depression and serious cardiac adverse reactions 2, 3
- Antiemetics (ondansetron) are NOT recommended for children under 4 years of age 2
- Antibiotics are NOT indicated for simple acute watery diarrhea unless bloody diarrhea (dysentery), high fever, or diarrhea persisting >5 days is present 5, 2
Reassessment and Red Flags
Reassess hydration status after 2-4 hours of rehydration. 2, 3
Instruct parents to return immediately if:
- Persistent watery stools continue or worsen 2
- Intractable vomiting develops 5, 2
- Decreased urine output occurs 5
- Child becomes irritable, lethargic, or condition worsens 5, 2
- Bloody diarrhea appears 2
- High fever develops 2