Babies and young kids get dehydrated fast from vomiting, diarrhea, or not drinking. They have more body water and higher fluid needs than adults, so small losses matter.
How severe is it?
| Signs | Mild | Moderate | Severe |
|---|---|---|---|
| Behavior | Normal, thirsty | Fussy or tired | Very sleepy, hard to wake, or limp |
| Mouth and tears | Slightly dry | Dry, fewer tears | Very dry, no tears |
| Eyes and fontanel | Normal | Sunken | Very sunken |
| Heart rate | Normal | Fast | Very fast, weak pulse |
| Capillary refill | Under 2 seconds | About 2 to 3 seconds | Over 3 seconds, cool or mottled skin |
| Urine | Slightly less | Much less | Little or none |
Remember: low blood pressure is a late sign in children.
Best ways to track fluid status
- Daily weight on the same scale, at the same time, with the same clothing (or none). It is the most accurate measure. 1 kg of weight loss is about 1 liter of fluid.
- Intake and output, including weighed diapers (1 gram is about 1 mL).
- Urine color and specific gravity.
Nursing care
- Mild to moderate: oral rehydration solution in small, frequent amounts, like 5 mL every 1 to 2 minutes by spoon or syringe. Keep breastfeeding.
- Avoid juice, soda, and sports drinks. Their sugar can make diarrhea worse.
- Severe: IV fluids as ordered, often a 20 mL/kg isotonic bolus, then reassess.
- Watch the potassium. Make sure the child is urinating before potassium is added to IV fluids.
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Quick answers
What is the best way to assess dehydration in a child?
Daily weight is the most accurate measure. About 1 kg of weight loss equals about 1 liter of fluid lost.
What should a child with mild dehydration drink?
Oral rehydration solution in small, frequent amounts. Avoid juice, soda, and sports drinks.
Evidence & Clinical Sources
- CDC: Managing Acute Gastroenteritis Among Children (MMWR, 2003)
- Hockenberry, Wong's Essentials of Pediatric Nursing, Elsevier
Reviewed against current guidelines and drug labels. Always follow your program, a current drug reference, and facility policy. Our sources policy
For learning only. Lab ranges and policies vary. Always follow your nursing program, a current drug reference, and your facility's policies.