We're hearing more about what's going on in our gut - what bacteria lives there and what impacts it.
In babies, new research has found what mums-to-be eat during pregnancy and how they deliver, may have an effect on the composition of the baby's gut microbiome.
This could be used to give dietary tips for pregnant women.
Lead author of the paper, Sara Lundgren from the School of Medicine at Dartmouth, explains.
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