Acute diarrhea — defined as three or more loose or watery stools in a single day — is one of the most common illnesses in young children, particularly those under five years old. While diarrhea itself is usually short-lived, the real danger lies in how quickly it can lead to dehydration. In small children, dehydration can become life-threatening within hours if not managed correctly.
What Causes Acute Diarrhea in Children?
The vast majority of acute diarrhea cases in children are caused by viruses, with rotavirus being the most common culprit — especially in infants and toddlers. Other causes include:
- Bacteria: Usually linked to contaminated food or water. Symptoms tend to be more severe and may include blood in the stool.
- Parasites: Less common but worth considering in areas with poor sanitation or after travel.
- Antibiotics: These can disrupt the natural balance of gut bacteria, leading to diarrhea as a side effect.
- Food intolerance or allergy: Some children react to certain foods — such as dairy — with episodes of loose stools.
Recognising Dehydration — Act Quickly
Dehydration is the most dangerous complication of acute diarrhea. Parents should check for these signs regularly:
Mild to moderate dehydration:
- Dry mouth and tongue.
- Fewer or no tears when crying.
- Less frequent urination (fewer wet nappies than usual).
- Slightly sunken eyes.
- Increased fussiness or irritability.
Severe dehydration — seek emergency care immediately:
- Very sunken eyes; skin that looks wrinkled or grey.
- Extreme drowsiness, difficulty waking, or unresponsiveness.
- Very dry lips and mouth; no urination for several hours.
- Skin that stays pinched when gently pulled — it does not spring back quickly.
- Rapid or laboured breathing.
Home Care for a Child With Diarrhea
Prompt rehydration is the most important step. Parents should:
- Use oral rehydration solution (ORS): Mix according to the packet instructions and give small, frequent sips. ORS is the safest and most effective way to replace lost fluids and minerals.
- Continue breastfeeding: If your baby is still breastfed, do not stop. Breast milk provides both fluids and antibodies that help the body fight infection.
- Keep feeding: Do not starve a child with diarrhea. Continue offering soft, easy-to-digest foods such as rice porridge, mashed banana, or boiled potato. Avoid sugary fruit juices and carbonated drinks.
- Do not give antibiotics without a prescription: Most acute diarrhea is viral — antibiotics will not help and may make things worse.
- Do not use anti-diarrheal medications: These are generally not recommended for children under five years without specific medical guidance.
When to Go to the Doctor Immediately
Bring your child to a doctor or emergency room without delay if:
- Your child is under six months old and has diarrhea.
- There are signs of moderate or severe dehydration.
- The stool contains blood or mucus.
- Your child is vomiting repeatedly and cannot keep fluids down.
- Diarrhea has lasted more than five to seven days without improvement.
- Your child has a high fever (above 39°C / 102.2°F) alongside diarrhea.
Childhood diarrhea can escalate quickly, but with the right care it can also resolve quickly. At Ky Hoa Medical Center, our paediatric team is experienced in assessing dehydration levels and providing the most appropriate treatment plan for each child. When in doubt, come in — acting early is always the safest choice.