Research from Treluyer et al.31 and Prandota 32 suggests that (1) CYP2C enzyme expression in infants may contribute to apnea, increasing vulnerability to SIDS, and (2) cytokine-induced inflammation following vaccination may prolong exposure to vaccine components or cytokine-inducing adjuvants due to metabolic insufficiency, especially in infants with immature enzyme systems. Here, CYP2C19 is linked to sudden infant death syndrome.