Research shows that extremely premature babies who received probiotics had a 4.8% death rate compared to 13.9% in babies who didn’t receive them, suggesting probiotics may reduce mortality risk by about 69%. According to Gram Research analysis of this 13-year study, probiotics did not clearly reduce serious intestinal infections requiring surgery, though survival benefits appeared significant.
Researchers studied 581 extremely premature babies born before 29 weeks of pregnancy to see if probiotics, which are helpful bacteria, could improve their health. According to Gram Research analysis, babies who received probiotics had a lower chance of dying in the hospital compared to those who didn’t receive them. However, probiotics didn’t clearly reduce a serious intestinal infection called necrotizing enterocolitis. This 13-year study from one hospital suggests probiotics might help these fragile babies survive, though more research is needed to understand exactly how they work.
Key Statistics
A 13-year single-center cohort study of 581 extremely premature infants born before 29 weeks found that probiotic-exposed babies had a 4.8% in-hospital mortality rate compared to 13.9% in unexposed babies, representing a 69% reduction in death risk.
Among 581 extremely premature infants studied from 2012 to 2024, probiotic exposure was associated with adjusted odds of in-hospital mortality of 0.31 (95% CI 0.10-0.93), meaning probiotics reduced the odds of dying by approximately 69%.
In a 13-year cohort of 581 infants born before 29 weeks’ gestation, 86.4% received probiotics while 13.6% did not, yet no clear difference in severe necrotizing enterocolitis requiring surgery was observed between the two groups.
A 2026 single-center study of 581 extremely premature infants found that routine probiotic supplementation was associated with lower in-hospital mortality but did not clearly reduce culture-positive late-onset sepsis or severe intestinal infections.
The Quick Take
- What they studied: Whether giving premature babies helpful bacteria called probiotics could reduce their risk of dying in the hospital and developing serious intestinal infections.
- Who participated: 581 extremely premature babies born before 29 weeks of pregnancy who were treated in one hospital’s intensive care unit between 2012 and 2024. Most babies (502) received probiotics, while 79 did not.
- Key finding: Babies who received probiotics had a 4.8% death rate compared to 13.9% in babies who didn’t receive probiotics. This means probiotics were linked to about a 69% lower risk of dying in the hospital.
- What it means for you: If you have an extremely premature baby in intensive care, probiotics might help improve their chances of survival. However, this is one hospital’s experience, and parents should discuss probiotic use with their baby’s medical team to understand if it’s right for their situation.
The Research Details
Researchers looked back at 13 years of medical records from one hospital to compare premature babies who received probiotics with those who didn’t. Probiotics are live beneficial bacteria that help with digestion and gut health. The babies were extremely premature, born before 29 weeks of pregnancy, which means they were born very early and needed intensive medical care.
The researchers carefully matched the two groups of babies by looking at factors like how early they were born, their birth weight, sex, and whether their mothers received steroids before delivery. These factors can affect how sick premature babies become. The researchers then used advanced statistical methods to compare outcomes between the two groups while accounting for these differences.
The main outcomes they tracked were whether babies survived their hospital stay and whether they developed a serious intestinal infection called necrotizing enterocolitis that required surgery. They also looked at other infections and how quickly babies could eat normally.
This type of study is important because it looks at real-world experience from actual patients over many years, rather than just testing probiotics in a laboratory. By studying babies from the same hospital using the same medical practices, the researchers could reduce confusion from different hospitals using different approaches. The long 13-year timeframe also shows whether the results stayed consistent over time.
This study has several strengths: it included a large number of babies, used careful statistical methods to account for differences between groups, and covered a long time period. However, it has limitations. It was conducted at only one hospital, so results might differ elsewhere. The researchers couldn’t randomly assign babies to receive probiotics or not, which is the gold standard for proving something works. Additionally, the study used two different probiotic products during different time periods, which could affect results.
What the Results Show
The most important finding was that premature babies who received probiotics had significantly lower death rates. Only 4.8% of babies receiving probiotics died in the hospital, compared to 13.9% of babies who didn’t receive probiotics. After the researchers adjusted for differences between groups, babies receiving probiotics had about 69% lower odds of dying.
However, probiotics did not clearly reduce the risk of severe intestinal infections requiring surgery. The rates of this serious infection were similar between babies who received probiotics and those who didn’t. This was surprising because previous studies suggested probiotics might prevent this type of infection.
Probiotics also didn’t clearly reduce other serious infections caused by bacteria in the bloodstream. Both groups had similar rates of these infections. The time it took for babies to start eating normally through their stomach was also similar between groups.
The study found that baseline characteristics were well-balanced between the two groups. Babies in both groups had similar gestational ages, birth weights, sex distribution, and exposure to steroids before birth. This balance strengthens confidence that differences in outcomes were related to probiotic use rather than other factors. The researchers also performed additional statistical analyses to confirm their main findings, and these sensitivity analyses supported the primary results about reduced mortality.
Previous research on probiotics in premature babies has shown mixed results. Some studies reported that probiotics reduced both death rates and intestinal infections, while others found no clear benefit. This study adds to that mixed picture by showing a benefit for survival but not for intestinal infections. The difference might be because this study focused specifically on extremely premature babies born before 29 weeks, whereas many previous studies included less premature babies. Different probiotic strains and dosing schedules used across studies may also explain why results vary.
This study was conducted at only one hospital, so results might not apply to other hospitals with different practices or patient populations. The researchers couldn’t randomly assign babies to receive probiotics, which is the strongest way to prove something works. Instead, they observed which babies happened to receive probiotics and which didn’t. The study used two different probiotic products during different time periods, making it unclear which product was responsible for benefits. Additionally, the study excluded babies who died within the first week, which might have affected results. Finally, the group without probiotics was small (79 babies), which makes it harder to detect effects on less common outcomes.
The Bottom Line
Based on this research, probiotics may help reduce death rates in extremely premature babies. However, the evidence is moderate in strength because this is one hospital’s experience. Parents and doctors should consider probiotics as a potential tool, but should discuss the specific probiotic product, dosage, and timing with their medical team. More research across multiple hospitals is needed before making strong recommendations.
Parents of extremely premature babies born before 29 weeks of pregnancy should discuss probiotics with their baby’s intensive care team. Neonatal doctors and nurses caring for very premature babies should be aware of this potential benefit. However, babies born after 29 weeks and full-term babies may have different responses, so these findings don’t necessarily apply to them.
If probiotics help, the benefit appears to develop over the entire hospital stay, not immediately. Premature babies typically spend weeks to months in intensive care, so improvements in survival would be measured over this longer timeframe rather than days.
Frequently Asked Questions
Do probiotics help premature babies survive?
Research from a 13-year study of 581 extremely premature babies found that those receiving probiotics had a 4.8% death rate versus 13.9% without probiotics. This suggests probiotics may reduce mortality risk, though more research across multiple hospitals is needed.
Can probiotics prevent serious intestinal infections in premature babies?
This study found no clear evidence that probiotics prevented severe intestinal infections requiring surgery in extremely premature babies. While previous research suggested this benefit, results remain mixed across different studies.
What probiotics are safe for extremely premature infants?
This study used two specific probiotic products given sequentially over 13 years, but the research doesn’t specify which strains or dosages were most effective. Parents should ask their baby’s medical team which probiotic products are recommended and why.
How long do premature babies need to take probiotics?
This study tracked babies throughout their hospital stay but didn’t specify optimal probiotic duration. The length of treatment should be determined by your baby’s medical team based on individual health needs and hospital protocols.
Are probiotics recommended for all premature babies?
This study focused specifically on extremely premature babies born before 29 weeks. Results may not apply to less premature babies. Your neonatal team should assess whether probiotics are appropriate for your baby’s specific situation.
Want to Apply This Research?
- If your premature baby is receiving probiotics in the hospital, track the specific probiotic product name, dosage, and start date. Also note any changes in feeding tolerance, infection rates, or other health markers your medical team monitors.
- Work with your baby’s medical team to establish a consistent probiotic schedule if recommended. Ask your care team to explain which probiotic product is being used and why, so you understand the treatment plan.
- Keep detailed records of your baby’s hospital course, including probiotic administration dates, feeding progress, infection episodes, and discharge outcomes. Share this information with your pediatrician after discharge to track long-term health outcomes.
This research describes outcomes from one hospital’s experience with probiotics in extremely premature babies. Individual results may vary based on probiotic product, dosage, timing, and each baby’s unique health situation. Probiotic use in premature infants should only be undertaken under direct medical supervision by a neonatal care team. This article is for educational purposes and should not replace professional medical advice. Parents should discuss all treatment options, including probiotics, with their baby’s doctors before making any decisions.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.