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so perhaps the impact of the hygiene hypothesis starts at birth?
Babies often get a dose of human gut bacteria during the birth process
Children born via cesarean section are slightly more likely than babies delivered vaginally to become heavy or obese ∙∙∙Why the link?It's not clear why c-section births are tied to a better chance of being heavy.One possibility relates to the bacteria babies are exposed to when they are delivered vaginally, which might affect the way they process and store food, said Liu.Additionally, Liu added, researchers have suggested that c-sections are linked with a lower concentration in the umbilical cord of a hormone important in regulating weight and with a reduced rate of breastfeeding, "both of which are reported to be associated with an increased risk of later obesity."Babies who are larger than normal are also more likely to be born via cesarean, but most of the studies Liu's team analyzed took into account birth weight.