The CDC stated a lack of biological plausibility for a 2.4x increased risk of autism in African American boys given the MMR vaccine, but there's plenty. How vaccines affect the infant microbiome is unknown.
Breastfeeding is not simply a source of nutrients for the newborn. The mother, through her breast milk quality, programs critical immunological, metabolic and microbiological aspects of the baby’s physiology that will determine greatly his/her health status, even as an adult.
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