Should babies have probiotics?
Guidance differs by country — Not recommended for infant crying in the UK. Never give a probiotic to a preterm or hospitalised baby without a paediatrician's involvement
For colic, NICE tells clinicians not to recommend probiotic supplements and the NHS says there is no evidence they help. The reviews are genuinely mixed: one found no clear benefit for prevention but reduced daily crying time, at low certainty. In preterm infants the FDA has warned of invasive, potentially fatal infection.
The verdict
This is a case where the honest answer is more complicated than either side of the argument wants it to be, so here is the whole of it.
For colic, UK guidance says do not recommend probiotics. The evidence behind that instruction is not uniformly negative: it is low-certainty and mixed, with a real signal for reduced crying time in breastfed babies. Australia acknowledges that signal. The United States allows a supervised trial. And in preterm babies there is a documented, serious safety problem that has nothing to do with whether probiotics work.
What the reviews actually found
NICE Clinical Knowledge Summaries sets out the evidence in unusual detail, and it is worth reporting rather than summarising away.
A Cochrane meta-analysis of six studies, covering 1,886 participants, found no clear evidence that probiotics are more effective than placebo at preventing infantile colic. In the same analysis, daily crying time reduced compared with placebo. The authors reported a limited ability to draw conclusions because of the low certainty of the evidence.
Read that carefully, because it is two findings, not one. Probiotics did not prevent colic. Babies given them cried somewhat less. Both statements come from the same analysis, and the certainty attached to both is low.
NICE also records that an additional systematic review found high-quality evidence that probiotics in breastfed infants reduce crying time, which is a stronger statement than the Cochrane one, and that expert opinion in review articles cites emerging evidence of possible benefit from specific strains, particularly in breastfed infants, while noting that the long-term effects of these supplements are not known and more good-quality research is needed.
The breastfed and formula-fed split
The pattern that keeps recurring is that where a benefit shows up, it shows up in breastfed babies. Trials in formula-fed babies have been much less encouraging. Nobody has established why with confidence, though the interaction between milk oligosaccharides and gut bacteria is the usual explanation offered.
If you have read that probiotics are proven for colic, you have probably read a summary of the breastfed-infant findings with the qualifications removed.
The preterm safety problem
This is separate from efficacy, it is serious, and it is not widely known outside neonatal units.
In 2023 the US Food and Drug Administration warned healthcare providers that preterm infants given products containing live bacteria or yeast are at risk of invasive, potentially fatal disease caused by the organisms in the product. The FDA stated it was aware that certain probiotic products used in hospital settings to prevent necrotising enterocolitis had contributed to invasive disease, including one infant death in 2023, and had been associated with more than two dozen other reported adverse events in the United States since 2018.
The FDA also stated that it has not approved any probiotic product for use as a drug or biological product in infants of any age, and issued warning letters to two companies selling probiotic products for use in preterm infants in hospital settings.
The mechanism is not mysterious. A preterm gut has an immature barrier, and live organisms introduced in large numbers can cross it and cause sepsis. In the fatal case described, genomic sequencing matched the organism causing sepsis to the bacteria in the product.
The FDA was careful to note that there are conflicting data in the literature on the safety and effectiveness of probiotics for preventing necrotising enterocolitis, and that research has been complicated by different products being used in different trials. This is not a claim that probiotics are useless in neonatal care. It is a warning about unapproved products given outside a trial framework to the most vulnerable babies there are.
Regulation, and what it means for the product on the shelf
Infant probiotics are sold as food or dietary supplements almost everywhere. They are not licensed medicines. That has three consequences that matter to a parent.
Composition is not standardised. Different products contain different species and strains at different counts, and strain matters: findings for one strain do not transfer to another.
Efficacy is not assessed before sale. Nothing on the label has been approved by a regulator as true in the way a medicine's indication has.
Manufacturing standards are lower than for medicines, and viable organism counts at the end of shelf life often differ from the label claim.
Where guidance differs
The UK is the strictest: NICE tells clinicians not to recommend probiotics for infant crying, and the NHS says there is no evidence they help colic.
Australia is the most positive: probiotics might reduce crying in colicky babies, particularly breastfed babies, with a conversation with a GP, lactation consultant or child and family health nurse first.
The United States sits between them on colic, allowing a supervised trial while stating these are not always helpful, and is by far the most forceful on preterm safety.
Ireland does not endorse them and treats the wider category of products marketed for infant digestive symptoms as unevidenced.
Notice what nobody says. No authority recommends routine probiotics for healthy term babies, and no authority claims they prevent colic.
If you want to try them anyway
That is a legitimate choice for a healthy, term, thriving baby with colic, and the AAP and Australian framing both accommodate it. Do it properly.
Talk to your GP, health visitor, public health nurse or paediatrician first, and say what you are planning to use. Do not give a probiotic to a preterm baby, a baby in hospital, a baby with a central line, or a baby who is immunocompromised, without that baby's own medical team deciding it. Give one product at a time and set a review date, a fortnight is reasonable, rather than continuing indefinitely because you cannot tell whether it is working. Follow the label for the amount. Stop if your baby develops fever, worsening feeding, vomiting or diarrhoea, and get them seen.
What is not in dispute
Colic peaks at around six weeks and settles by three to four months in almost every baby. Holding, motion, white noise, low stimulation, responsive feeding and winding all help, cost nothing and carry no risk. And crying with fever, poor weight gain, forceful vomiting, blood or mucus in the stool, or a baby who seems unwell rather than distressed is not colic, and needs a doctor rather than a supplement.
NICE Clinical Knowledge Summaries lists probiotic supplements among the management strategies clinicians should not recommend for infant crying. Its supporting evidence is that a Cochrane meta-analysis of six studies, with 1,886 participants, found no clear evidence that probiotics are more effective than placebo at preventing infantile colic, but that daily crying time reduced compared with placebo, and that the authors reported a limited ability to draw conclusions due to the low certainty of the evidence. It also records that an additional systematic review found high-quality evidence that probiotics in breastfed infants reduce crying time, and that expert opinion cites possible benefit of specific strains in breastfed infants while noting the long-term effects are not known. The NHS says probiotic supplements are not recommended and there is no evidence they help colic.
Showing guidance from NICE CKS and NHS — read the source.
Irish guidance does not endorse probiotic supplements for babies. The HSE's general position on products marketed for infant digestive symptoms is that the claims are unevidenced, saying of comfort milks that the labels often say they are made to help medical conditions such as colic or constipation, but there is no evidence that they work. Parents are asked to speak to a public health nurse or GP before changing a baby's feeding rather than adding products.
Showing guidance from HSE Ireland — read the source.
The American Academy of Pediatrics allows a supervised trial for colic, saying probiotics, gripe water or gas drops may be worth a try, but discuss it with your pediatrician first, and elsewhere that gas drops and probiotics are not always helpful. Separately, the US Food and Drug Administration has warned that preterm infants given products containing live bacteria or yeast are at risk of invasive, potentially fatal disease, that it has not approved any probiotic product for use as a drug or biological product in infants of any age, and that it issued warning letters to two companies selling probiotic products for use in preterm infants.
Showing guidance from AAP and FDA — read the source.
Australia is the most positive of the four, and still asks for clinical input. The Raising Children Network says probiotics might reduce crying in colicky babies, particularly breastfed babies, and that it's a good idea to talk with your GP, a lactation consultant or your child and family health nurse if you'd like to try probiotics. It sets that alongside its general position that comforting and settling a baby is likely to be more effective and less harmful than giving medicine.
Showing guidance from Raising Children Network — read the source.
Sources
- Infantile colic: Management — NICE Clinical Knowledge Summaries, accessed
- Colic — NHS, accessed
- FDA Raises Concerns About Probiotic Products Sold for Use in Hospitalized Preterm Infants — US Food and Drug Administration, accessed
- Risk of Invasive Disease in Preterm Infants Given Probiotics Formulated to Contain Live Bacteria or Yeast — US Food and Drug Administration, accessed
- Colic — Raising Children Network (Australia), accessed
- Abdominal Pain in Infants: 8 Possible Reasons Your Baby's Tummy Hurts — American Academy of Pediatrics, accessed