This study has “..shown that, at least in mice, this susceptibility is the work of special cells that actively suppress immune responses in newborns. This raises their risk of diseases, but it also creates a window during which helpful bacteria can colonize their guts.”
In newborn mice, a lot of their white blood cells have a protein on their surface called CD71, which suppresses the immune response of surrounding white blood cells.
When they are a week old, 66% of their white blood cells have this protein on them. A week later, 25% have the protein on them. By the third week, they look like adult mice in this regard.
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