The present invention is directed to providing a specific probiotic lactic acid bacterium strain to a pregnant mother to prevent and / or treat a health-related disease in an infant born with a non-optimal intestinal microbiome. This will allow early colonization of the infant digestive tract, even before birth, and thus prevent and / or treat health-related diseases associated with non-optimal microbiota. Accordingly, the present invention provides a probiotic microorganism for use in the treatment of a fetus or a newborn, wherein the probiotic microorganism is administered to the oral cavity of a pregnant woman in an agent suitable for forming a colony in the oral cavity, The tick microorganism is thus administered to the fetus. The methods and uses of the present invention can also provide for colony formation of the fetus or newborn, or variability of the microbium of the fetus or neonate.
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