Diarrhea in Babies & Toddlers
Content reviewed against published AAP, WHO, ESPGHAN guidelines
Last reviewed:
Diarrhea is defined as an increase in the frequency and looseness of stools compared to the baby's normal pattern. Breastfed newborns normally have very loose, seedy, yellow stools multiple times per day — this is NOT diarrhea. True diarrhea in babies is watery, occurs more frequently than usual, and often indicates a viral infection. The main risk is dehydration, which is the primary concern to monitor.
Key takeaways
- Diarrhea is defined as an increase in the frequency and looseness of stools compared to the baby's normal pattern.
- Most common cause: Viral gastroenteritis (rotavirus, norovirus, adenovirus)
- Emergency: Diarrhea with bloody stools and severe abdominal pain (possible intussusception or HUS)
- Home care: Continue breastfeeding — breast milk is the best fluid for a breastfed baby with diarrhea
Possible Causes
When to Seek Help
Emergency — Call 911 or go to ER:
- Diarrhea with bloody stools and severe abdominal pain (possible intussusception or HUS)
- Severe dehydration: lethargic, sunken eyes, no tears, very dry mouth, no urine for 8+ hours
- Diarrhea with high fever and infant under 3 months
- Diarrhea with altered consciousness or extreme lethargy
Urgent — See doctor today:
- Moderate dehydration: fewer than 3 wet diapers in 24 hours, dry mouth, no tears when crying
- Bloody diarrhea (more than streaks)
- Diarrhea with persistent vomiting (unable to keep oral rehydration down)
- Diarrhea with high fever above 104°F at any age
- Severe abdominal pain between loose stools
Same-day appointment:
- Diarrhea lasting more than 5-7 days without improvement
- Mild blood streaks or mucus in stool
- Diarrhea with mild dehydration but child still accepting some fluids
- Chronic diarrhea with poor weight gain
Monitor at home:
- Acute watery diarrhea less than 3 days with child maintaining hydration
- Loose stools after dietary changes or new foods
- Toddler's diarrhea in a well, growing child
- Loose stools while on antibiotics (if no blood or fever)
By Age
0-3 months
Normal: Breastfed babies often have 6-12 loose, seedy, yellow stools per day in the first weeks. This decreases over time. Formula-fed babies have fewer, firmer stools. A change from baby's baseline is more important than stool consistency alone.
Worry if: Truly watery stools (no substance) more frequently than usual, blood or mucus in stool, fever with diarrhea in baby under 3 months, or decreased wet diapers suggesting dehydration.
3-12 months
Normal: Stool patterns change with introduction of solids. Brief bouts of looser stool with dietary changes or mild viruses are common. Stool color changes with new foods are normal.
Worry if: Watery diarrhea lasting more than 5-7 days, blood in stool, fever above 102°F with diarrhea, signs of dehydration, or baby refusing fluids and having reduced wet diapers.
1-3 years
Normal: Toddler's diarrhea (3-6 loose stools per day in a well, growing child) is the most common cause of chronic diarrhea in toddlers. Child thrives despite loose stools.
Worry if: Diarrhea with blood, severe abdominal pain, high fever, weight loss, diarrhea lasting more than 2 weeks without improvement, or signs of dehydration at any point.
Any age
Normal: Brief viral gastroenteritis (1-5 days of loose stools) is extremely common and usually self-limiting.
Worry if: More than 8-10 watery stools per day, inability to keep fluids down, no wet diaper for 6-8 hours, sunken eyes or fontanelle, or child appears very ill.
Home Care
- Continue breastfeeding — breast milk is the best fluid for a breastfed baby with diarrhea
- Offer oral rehydration solution (Pedialyte) for bottle-fed babies and toddlers
- Give small, frequent sips rather than large amounts at once
- Continue regular diet (age-appropriate foods) — restriction of food is no longer recommended
- BRAT diet (bananas, rice, applesauce, toast) may help firm stools but is not required
- Avoid fruit juice, which can worsen diarrhea (osmotic effect)
- Protect diaper area with barrier cream (zinc oxide) to prevent severe diaper rash
- Probiotics (Lactobacillus) may reduce duration by about 1 day per some evidence
- Track number of wet diapers to monitor hydration status
- Do NOT give anti-diarrheal medications (Imodium) to children under 6
Need help deciding what to do?
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Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Related Symptoms
Bottom line
Most cases of diarrhea in babies are not emergencies. However, seek immediate care if diarrhea with bloody stools and severe abdominal pain (possible intussusception or hus).
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.