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Dynamics of IgG, IgM, and IgA levels in the first 2 years of life. Median MFI values, averaged for all children (n = 57), are presented by age (1.5, 6, 14, and 24 months). High levels of placentally transferred IgG are observed at 1.5 months and decrease in the first 6 months of life. After 6 months, an increase in the IgG levels is observed. Low levels of IgM and IgA in serum were observed after birth, but these clearly increased during the first year of life.
