Peer-reviewed studies on how the infant gut develops, and what shapes it.
A landmark study tracked over 900 children to nearly four years old, mapping three phases of gut development: a milk-fed start, a transition as solids arrive, then a steadier, more adult-like community.
Stewart CJ et al. Temporal development of the gut microbiome in early childhood from the TEDDY study. Nature. 2018 Oct;562(7728):583–588. PMID: 30356187.
Read the paper →Following infants from birth through their first year, this study showed how the gut shifts in step with milk, weaning and the move toward solid food.
Bäckhed F et al. Dynamics and stabilization of the human gut microbiome during the first year of life. Cell Host & Microbe. 2015;17(5):690–703.
Read the paper →A recent review of how the early microbiome develops alongside the immune system and the gut itself, and why its makeup in the first years draws research attention.
Younge N. Influence of infant microbiome on health and development. Clinical and Experimental Pediatrics. 2024;67(5):224–31.
Read the paper →Breast milk carries complex sugars called human milk oligosaccharides (HMOs) that babies can't digest on their own. Some bifidobacteria are specially adapted to feed on them, one reason this group tends to dominate the gut in breastfed babies.
Lordan C et al. Linking human milk oligosaccharide metabolism and early life gut microbiota: bifidobacteria and beyond. Microbiol Mol Biol Rev. 2024;88:e00094-23.
Read the paper →A course of antibiotics in infancy can shift the balance of the gut community, Bifidobacterium especially, for some months afterwards. Sometimes necessary, and the gut typically reshapes over time.
Korpela K et al. Antibiotics in early life associate with specific gut microbiota signatures in a prospective longitudinal infant cohort. Pediatric Research. 2020;88(3):438–43.
Read the paper →Researchers found that babies born vaginally and by caesarean start out with different gut communities in the first weeks of life, one of the earliest influences on how the gut is first seeded.
Shao Y et al. Stunted microbiota and opportunistic pathogen colonization in caesarean-section birth. Nature. 2019;574:117–121.
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Scientists are studying how the early gut microbiome relates to the developing immune system, including possible links to conditions like eczema, allergies and asthma.
In a large infant cohort, researchers observed that infants whose gut communities were slower to develop over the first year more often had allergic conditions (eczema, food allergy and asthma) later in childhood.
Hoskinson C et al. Delayed gut microbiota maturation in the first year of life is a hallmark of pediatric allergic disease. Nature Communications. 2023;14(1):4785.
Read the paper →In a cohort of Chinese infants followed from birth, researchers found gut differences that were associated with eczema in early childhood.
Cheung MK et al. Development of the early-life gut microbiome and associations with eczema in a prospective Chinese cohort. mSystems. 2023;8:e00521-23.
Read the paper →Researchers looked at different windows in early gut development, and how each related to eczema and food allergies.
Nunez H et al. Age-specific early-life gut microbiome associations with eczema and food allergies during early immune development. Frontiers in Microbiomes. 2026;5:1804117.
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Short pieces on the early gut, written for parents rather than for journals.
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We read the whole 16S ribosomal RNA gene rather than a short fragment of it, which lets many organisms be named to species. Subspecies cannot be identified this way.
Sequencing is done by an established South African genomics laboratory.
We’re building an infant microbiome reference base for South African infants, and every opted-in sample adds to it.
A kit takes five minutes at a nappy change, and the report comes back in plain language.
ilali is isiXhosa for ‘village’: a community raising a child, and a community of bacteria building a gut.