Spearman’s correlation analysis applied to the entire group revealed that C3-1 levels were correlated with F concentrations and the child’s age; C3-1 levels were correlated with maternal parity; F concentrations correlated with GB, TC, IL-6, the child’s age, and maternal parity; GB correlated with TC and IL-6; LF correlated with maternal immunization or infection status; LD concentrations correlated with TC, LF, the child’s age, and maternal infection or vaccination status; and TC correlated with IL-6 and the child’s age (Table 7). This evidence concerns the gene IL6 and infection.