Fig. 1From: Human perinatal immunity in physiological conditions and during infectionMaternal versus neonatal IgG concentrations over time (adapted from Wilson CB, Lewis DB, Penix LA. “The physiologic immunodeficiency of immaturity.” In Stiehm R, editor. Immunologic disorders in infants and children. 4th ed. Philadelphia: Saunders; 1996. p. 253–295)Back to article page