Probiotic Evidence for Babies
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, NIH, AAP guidelines
Last reviewed:
Digestive issues are common in infants and toddlers. If your baby is experiencing probiotic evidence for babies, here is what you need to know.
The short answer
Evidence for probiotics in babies varies by condition. Lactobacillus reuteri has the strongest evidence for reducing colic in breastfed infants. Saccharomyces boulardii can help prevent antibiotic-associated diarrhea. For general "gut health," evidence is limited. Probiotics are generally safe for healthy term infants but should be discussed with your pediatrician before starting.
Key takeaways
- Evidence for probiotics in babies varies by condition. Lactobacillus reuteri has the strongest evidence for reducing colic in breastfed infants. Saccharomyces boulardii can help prevent antibiotic-associated diarrhea. For general "gut health," evidence is limited. Probiotics are generally safe for healthy term infants but should be discussed with your pediatrician before starting.
- Usually normal when: Using a well-studied probiotic strain under your pediatrician's guidance for a specific condition
- Call your doctor if: Your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, NIH guidelines, evidence for probiotics in babies varies by condition. Lactobacillus reuteri has the strongest evidence for reducing colic in breastfed infants. Saccharomyces boulardii can help prevent antibiotic-associated diarrhea. For general "gut health," evidence is limited. Probiotics are generally safe for healthy term infants but should be discussed with your pediatrician before starting. At 0-3 months, lactobacillus reuteri DSM 17938 has shown benefit in reducing crying time in breastfed babies with colic when started early. Probiotics are generally safe for healthy full-term infants. Premature infants in the NICU may receive specific probiotics under medical supervision to reduce the risk of necrotizing enterocolitis. It is generally considered normal when using a well-studied probiotic strain under your pediatrician's guidance for a specific condition. However, you should contact your pediatrician promptly if your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic.
Normal vs. Concerning
By Age
What to expect by age
0-3 months
Lactobacillus reuteri DSM 17938 has shown benefit in reducing crying time in breastfed babies with colic when started early. Probiotics are generally safe for healthy full-term infants. Premature infants in the NICU may receive specific probiotics under medical supervision to reduce the risk of necrotizing enterocolitis.
3-6 months
If your baby is taking antibiotics, your pediatrician may recommend Saccharomyces boulardii or Lactobacillus GG to reduce antibiotic-associated diarrhea. Give the probiotic 2 hours apart from the antibiotic dose. Evidence for probiotics preventing eczema or allergies is mixed and not conclusive.
6-12 months
For acute viral gastroenteritis, Lactobacillus GG may slightly reduce the duration of diarrhea. Probiotics are not harmful but are not a substitute for oral rehydration. Fermented foods like yogurt with live cultures are natural sources of probiotics as solid foods expand.
12-24 months
Toddlers can get probiotics from yogurt, kefir, and other fermented foods. Supplemental probiotics may be considered during antibiotic courses or for recurrent digestive issues. The evidence for daily probiotic supplements in healthy toddlers is not strong enough to make a blanket recommendation.
What to Tell Your Pediatrician
- Describe when you first noticed probiotic evidence for babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you want to discuss whether a probiotic would benefit your baby's specific condition.
- Mention if your baby has colic and you want to try Lactobacillus reuteri.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Using a well-studied probiotic strain under your pediatrician's guidance for a specific condition
- Offering yogurt with live cultures as part of a balanced diet
- You want to discuss whether a probiotic would benefit your baby's specific condition
- Your baby has colic and you want to try Lactobacillus reuteri
- You need guidance on which probiotic strain and dose is appropriate
- Your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic
- An immunocompromised infant is being considered for probiotics, which requires careful medical guidance
What You Can Do at Home
- Keep track of when you notice probiotic evidence for babies — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that using a well-studied probiotic strain under your pediatrician's guidance for a specific condition — this is generally within the range of normal.
- At 0-3 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Keep your baby upright for 20-30 minutes after feeding. Note any patterns between feeds and symptoms.
- While monitoring at home, seek immediate care if your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic.
Related Conditions
Antibiotic-Associated Diarrhea in Baby
Diarrhea during or after antibiotic use is very common in babies because antibiotics kill beneficial gut bacteria along with the infection-causing ones. It typically resolves within a few days of completing the antibiotic course. Probiotics (particularly Saccharomyces boulardii or Lactobacillus) may help reduce antibiotic-associated diarrhea when given alongside the medication.
Gas Relief Drops (Simethicone) for Baby
Simethicone gas drops (brand names Mylicon, Little Remedies Gas Relief) are safe for babies and work by breaking up gas bubbles in the stomach, making them easier to pass. They are not absorbed into the body. While they are very safe, research shows mixed evidence on whether they significantly reduce gas symptoms compared to placebo. They are worth trying but do not work for all babies.
Colic Remedy Drops Effectiveness
Most over-the-counter colic drops and remedies have limited scientific evidence supporting their effectiveness. Simethicone has some safety data but mixed efficacy evidence. Lactobacillus reuteri probiotics have the strongest evidence for breastfed babies with colic. The most important thing to know is that colic resolves on its own by 3 to 4 months regardless of treatment.
Related Resources
Poop Color & Texture Guide
What your baby's poop color and consistency mean, and when to worry.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is probiotic evidence for babies normal?
When should I call the doctor about probiotic evidence for babies?
When is probiotic evidence for babies normal?
What causes probiotic evidence for babies?
What should I mention to my pediatrician about probiotic evidence for babies?
Is probiotic evidence for babies normal at 0-3 months?
Is probiotic evidence for babies normal at 3-6 months?
Should I go to the ER for probiotic evidence for babies?
Does probiotic evidence for babies go away on its own?
References
- [1]American Academy of Pediatrics. Probiotics for Children. HealthyChildren.org. AAP
- [2]National Library of Medicine. Probiotics for Prevention and Treatment of Diarrhea. Journal of Clinical Gastroenterology. NIH
- [3]American Academy of Pediatrics. Clinical Report: Probiotics and Prebiotics in Pediatrics. Pediatrics. AAP
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Probiotic Evidence for Babies.
Things to mention
- Describe when you first noticed probiotic evidence for babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you want to discuss whether a probiotic would benefit your baby's specific condition.
- Mention if your baby has colic and you want to try Lactobacillus reuteri.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- You want to discuss whether a probiotic would benefit your baby's specific condition
- Your baby has colic and you want to try Lactobacillus reuteri
- You need guidance on which probiotic strain and dose is appropriate
Urgent signs to report immediately
- Your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic
- An immunocompromised infant is being considered for probiotics, which requires careful medical guidance
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of probiotic evidence for babies are normal. Talk to your pediatrician if your baby develops a negative reaction (increased fussiness, rash, or worsening symptoms) after starting a probiotic.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Digestive Concerns
Antibiotic-Associated Diarrhea in Baby
Diarrhea during or after antibiotic use is very common in babies because antibiotics kill beneficial gut bacteria along with the infection-causing ones. It typically resolves within a few days of completing the antibiotic course. Probiotics (particularly Saccharomyces boulardii or Lactobacillus) may help reduce antibiotic-associated diarrhea when given alongside the medication.
Gas Relief Drops (Simethicone) for Baby
Simethicone gas drops (brand names Mylicon, Little Remedies Gas Relief) are safe for babies and work by breaking up gas bubbles in the stomach, making them easier to pass. They are not absorbed into the body. While they are very safe, research shows mixed evidence on whether they significantly reduce gas symptoms compared to placebo. They are worth trying but do not work for all babies.
Colic Remedy Drops Effectiveness
Most over-the-counter colic drops and remedies have limited scientific evidence supporting their effectiveness. Simethicone has some safety data but mixed efficacy evidence. Lactobacillus reuteri probiotics have the strongest evidence for breastfed babies with colic. The most important thing to know is that colic resolves on its own by 3 to 4 months regardless of treatment.
My Baby's Belly Looks Swollen
A rounded, slightly protruding belly is completely normal in babies and toddlers due to immature abdominal muscles and their proportionally larger organs. However, if the belly becomes suddenly swollen, feels hard and tight, or is accompanied by pain, vomiting, or changes in bowel movements, it needs medical evaluation as it could signal gas buildup, constipation, or rarely, something more serious.
My Baby Has an Anal Fissure (Blood When Pooping)
A small streak of bright red blood on the surface of your baby's stool or on the diaper is most commonly caused by an anal fissure, which is a tiny tear in the skin around the anus from passing hard stool. Anal fissures are very common in babies and toddlers and usually heal on their own with simple measures like keeping stools soft. While this is rarely serious, any blood in your baby's stool should be mentioned to your pediatrician.
Can Antibiotics Damage My Baby's Gut?
Antibiotics can temporarily disrupt your baby's gut microbiome, which may cause loose stools, fussiness, or diaper rash during and shortly after treatment. However, when antibiotics are medically necessary, the benefits of treating the infection far outweigh the temporary gut disruption. Most babies' microbiomes recover within weeks to months, especially with breastfeeding and a gradual return to normal feeding patterns.