Immune reconstitution after birth. (A) CD3⁺, CD4⁺, CD8⁺, CD31⁺CD45RA⁺CD4⁺, CD19⁺, and CD56⁺ cell counts. (B) Immunoglobulin A (IgA), IgM, and IgG reconstitution. (C) TRECs. Dots correspond to the values recorded. The lower and upper boundaries of the age-specific normal range are indicated by solid and dashed lines, respectively.