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Changes in immunity in the first 100 days of life. (Because the maternal placenta and breast milk can provide the baby with immunoglobulins, there is little illness before 6 months; after 6 months, the immunoglobulin is at its lowest point, and the autoimmune globulin level is still very low, so supplementing with oral active immunoglobulin is key; figure drawing is based on [79,80,81,100]).
