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Green Stool Predominance in Babies and Subsequent Bowel Function at 1-2 Years of Age

L Typpö1, T Solasaari1,2, K Korpela3

  • 1Faculty of Medicine, University of Helsinki, Helsinki, Finland.

Acta Paediatrica (Oslo, Norway : 1992)
|March 5, 2026
PubMed

Insights

Early infant green stools or frequent crying were linked to mild gastrointestinal issues later in infancy. These findings in healthy term babies suggest potential links to gut microbiota changes.

Area of Science:

  • Pediatric gastroenterology
  • Infant health
  • Microbiome research

Background:

  • Early life bowel function in term infants can vary.
  • Green stools and excessive crying are common infant occurrences.
  • Long-term implications of these early variations require investigation.

Purpose of the Study:

  • To investigate the association between early-life bowel characteristics (green stools, crying) and later bowel function in term infants.
  • To determine if these early signs predict benign gastrointestinal symptoms at 1-2 years of age.

Main Methods:

  • Prospective cohort study (HELMİ cohort) of term infants.
  • Comparison of infants with predominantly green stools and high crying frequency against matched controls.
  • Bowel function assessment at 1-2 years of age.

Main Results:

  • Infants with early green stools showed increased reports of abdominal symptoms (1.5-2x) and stool-mucus at 1-2 years.
  • Infants who cried most frequently exhibited higher defecation frequency and more frequent stool-mucus at 1 year.
  • No severe gastrointestinal dysfunction was observed in any group.

Conclusions:

  • Occasional abdominal pain and green stools in healthy term infants are associated with benign gastrointestinal symptoms later in infancy.
  • These functional variations may indicate altered gut microbiota.
  • Further research is warranted to explore the role of microbiota in these infant bowel function variations.
Abstract

Keywords:
birth cohortdefecationnewbornstool colourstool consistency

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