Viral stomach illness
A virus is a common reason a baby has diarrhea, sometimes along with vomiting, fussiness, or a mild fever.
Worried About Infant Diarrhea?
Get clear, parent-friendly guidance on baby diarrhea, possible infant diarrhea causes, and when loose or watery stools may need medical attention.
About 3–5 minutesPrivate assessmentNo long answers
About this assessment
Answer a few questions about your baby's symptoms
Tell us what your infant's diarrhea looks like right now to get personalized guidance on what may be normal, how to treat infant diarrhea at home, and when to call a doctor.
01
What counts as diarrhea in infants?
Infant poop can vary a lot, especially in newborns and breastfed babies. Diarrhea in infants usually means stools are suddenly more frequent, more watery, or much looser than your baby's usual pattern. If you're thinking, "Is this normal poop or baby diarrhea?" the most helpful clue is a clear change from what is typical for your baby.
02
Common infant diarrhea causes
Feeding changes or sensitivity
Formula changes, food sensitivities, or starting solids can sometimes lead to loose stools in an infant.
Medicines or antibiotics
Some medicines can cause baby diarrhea or make stools more watery for a short time.
03
What to watch for at home
Signs of dehydration
Watch for fewer wet diapers, dry mouth, no tears when crying, unusual sleepiness, or a sunken soft spot.
How often stools are happening
Frequent watery stool in a baby can lead to fluid loss faster than many parents expect, especially in younger infants.
Other symptoms
Vomiting, fever, blood in the stool, or poor feeding can change how urgently your baby should be evaluated.
04
How to treat infant diarrhea
For many babies, the main focus is preventing dehydration. Keep feeding as directed by your pediatric clinician, whether breast milk or formula, unless you've been told otherwise. Avoid giving over-the-counter diarrhea medicines unless a doctor specifically recommends them for your infant. If symptoms are getting worse, your baby is not feeding well, or you're worried about dehydration, seek medical care.
05
When to call a doctor for infant diarrhea
Your baby is very young
Newborn diarrhea deserves extra attention because very young babies can become dehydrated quickly.
There are dehydration concerns
Call promptly if your infant has fewer wet diapers, seems weak, has a dry mouth, or is hard to wake.
Symptoms are severe or unusual
Get medical advice if diarrhea is frequent, lasts more than a day or two, includes blood, or comes with repeated vomiting or fever.
05
Frequently asked questions
How can I tell the difference between normal newborn poop and newborn diarrhea?
Normal newborn stools can be loose, seedy, and frequent, especially in breastfed babies. Newborn diarrhea is more likely when stools become much more watery, happen more often than usual, or are a sudden change from your baby's normal pattern.
Is watery stool in a baby always a sign of illness?
Not always. Some babies naturally have loose stools. What matters most is whether the stool is more watery than usual, happening more often, or paired with symptoms like vomiting, fever, poor feeding, or signs of dehydration.
What should I do if my baby has diarrhea but seems okay otherwise?
Keep a close eye on feeding, wet diapers, and energy level. Many mild cases improve with careful monitoring and continued fluids. If stools become frequent and watery, your baby feeds less, or you notice dehydration signs, contact your doctor.
When is infant diarrhea an emergency?
Seek urgent care if your baby is hard to wake, has trouble breathing, shows clear signs of dehydration, has blood in the stool, or cannot keep fluids down because of repeated vomiting.
Personalized assessment
Get personalized guidance for your baby's diarrhea
Answer a few questions to better understand possible causes, what to do next at home, and when your infant may need medical care.