Seeding of the infant gut microbiota
Babies born vaginally are ‘inoculated’ with an abundance of beneficial maternal microbes, which those born by caesarean section are largely deprived of. These microbes provide the foundations from which a healthy gut microbiota can develop. Over subsequent months, babies born by caesarean section gradually ‘catch up’, such that by around 3 years, their microbiota is broadly similar, although some differences persist. Over this 3-year period, the maturation of the gut microbiota is shaped by variables such as skin-to-skin contact, maternal and infant nutrition, environmental conditions, antibiotic exposure and host genetics1-3.
A balanced and healthy gut microbiota promotes good health
The immune system is shaped, expanded and refined throughout infancy and early childhood, largely driven by interactions with the gut microbiota. A balanced, healthy early gut microbiota supports optimal gut and systemic health, while disturbances/imbalances may be associated with childhood and adult conditions, such as allergy (e.g. asthma and atopic eczema), diabetes, obesity, inflammatory bowel disorders, cardiovascular diseases and neurological disorders4,5.
Breastfeeding supports softer stools and immune resilience
Breast milk contains maternal microbes, which are transmitted during breastfeeding and contribute to colonisation of the infant gut. It is also rich in non-digestible carbohydrates (human milk oligosaccharides), which promote the growth of beneficial microbes, helping to shape the gut microbiota. A balanced infant gut microbiota, rich in Bifidobacterium and other beneficial bacteria, promotes softer stool consistency and supports immune maturation6-8.
Gut support for bottle-fed babies
Breastfeeding is the optimal source of infant nutrition, and plays a critical role in shaping a healthy infant gut microbiota. However, if bottle-feeding, some simple considerations can help mitigate the potential downsides of not breastfeeding. Ideally, expressed breastmilk should be used immediately; if stored, it should be refrigerated for no more than 5 days, or frozen in single portions to avoid repeated thawing. Gentle warming (not microwaving) helps preserve important bioactive compounds. If using infant formula, those enriched with prebiotic oligosaccharides – particularly human milk oligosaccharides (e.g. 2’-FL) – provide key nutrients that help support a healthy infant gut microbiota9,10.
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