Related Experiment Video
Updated: Jun 2, 2026

Probiotic Studies in Neonatal Mice Using Gavage
Published on: January 27, 2019
Probiotics-supplemented feeding in extremely low-birth-weight infants
1Department of Pediatrics, Saint Louis University School of Medicine, St Louis, MO, USA. alhosnim@slu.edu
Insights
Probiotic-supplemented feeding in extremely low-birth-weight (ELBW) infants improved growth velocity but did not reduce the percentage of infants with growth delay. No adverse events were reported in this randomized controlled trial.
Area of Science:
- Neonatal nutrition and growth
- Probiotic supplementation in infants
- Extremely low-birth-weight (ELBW) infant care
Background:
- Extremely low-birth-weight (ELBW) infants are at high risk for growth delay and feeding intolerance.
- Probiotics are being investigated for their potential to improve gut health and growth in vulnerable infant populations.
- Previous studies have shown mixed results regarding the efficacy of probiotics in ELBW infants.
Purpose of the Study:
- To determine if probiotic-supplemented enteral feeding improves growth in ELBW infants by reducing the percentage of infants below the 10th percentile weight at 34 weeks postmenstrual age (PMA).
- To evaluate the impact of probiotics on feeding tolerance, including daily feeding volumes.
- To assess the effect of probiotics on the duration of antimicrobial treatment within the first 28 days.
Main Methods:
- A multicenter, randomized, double-blinded, controlled clinical study.
- Participants received either Lactobacillus rhamnosus GG and Bifidobacterium infantis (probiotic-supplementation group) or unsupplemented enteral feedings (control group).
- Infant weights, feeding volumes, and antimicrobial treatment days were monitored daily for 28 days; weights were also recorded at 34 weeks PMA.
Main Results:
- No significant difference was observed in the percentage of infants with weight below the 10th percentile at 34 weeks PMA between the probiotic (58%) and control (60%) groups (P=0.83).
- The probiotic group showed a higher calculated growth velocity (14.9 g/day) compared to the control group (12.6 g/day) (P=0.05).
- Feeding volumes and incidences of necrotizing enterocolitis (NEC) and mortality were similar between the groups.
Conclusions:
- Probiotic supplementation enhanced growth velocity in ELBW infants but did not improve the primary outcome of reducing the percentage of infants with growth delay at 34 weeks PMA.
- The study found no significant differences in feeding tolerance or NEC between the groups.
- No probiotic-related adverse events were reported, suggesting a favorable safety profile.
Objective:
The objective of this trial was to test whether probiotic-supplemented feeding to extremely low-birth-weight (ELBW) infants will improve growth as determined by decreasing the percentage of infants with weight below the 10th percentile at 34 weeks postmenstrual age (PMA). Other important outcome measures, such as improving feeding tolerance determined by tolerating larger volume of feeding per day and reducing antimicrobial treatment days during the first 28 days from the initiation of feeding supplementation were also evaluated.
Study Design:
We conducted a multicenter randomized controlled double-blinded clinical study. The probiotics-supplementation (PS) group received Lactobacillus rhamnosus GG and Bifidobacterium infantis added to the first enteral feeding and continued once daily with feedings thereafter until discharge or until 34 weeks (PMA). The control (C) group received unsupplemented feedings. Infant weight and feeding volumes were recorded daily during the first 28 days of study period. Weights were also recorded at 34 weeks PMA.
Result:
A total of 101 infants were enrolled (PS 50 versus C 51). There was no difference between the two groups in the percentage of infants with weight below the 10th percentile at 34 weeks PMA (PS group 58% versus C group 60%, (P value 0.83)) or in the average volume of feeding during 28 days after study entry (PS group 59 ml kg(-1) versus C group 71 ml kg(-1), (P value 0.11)). Calculated growth velocity was higher in the PS group compared with the C group (14.9 versus 12.6 g per day, (P value 0.05)). Incidences of necrotizing enterocolitis (NEC), as well as mortality were similar between the two groups.
Conclusion:
Although probiotic-supplemented feedings improve growth velocity in ELBW infants, there was no improvement in the percentage of infants with growth delay at 34 weeks PMA. There were no probiotic-related adverse events reported.
More Related Videos
Related Concept Videos
Development of Human Microbiota
Microbiota Modulation by Antibiotics
Development of the Oral Microbiota
Probiotics
Enteral Nutrition II: Nasointestinal and Gastrostomy Feeding
Nasointestinal Feeding
Nasointestinal feeding involves placing a tube through...

