Recently, the clinical efficacy of thrombin–antithrombin III complex (TAT), plasmin-α2-plasmin inhibitor complex (PIC), soluble thrombomodulin (sTM), and tissue plasminogen activator–inhibitor complex (t-PAIC) has been proven in sepsis and sepsis-induced coagulopathy; however, reports of these markers in the newborn are rare.5, 6We present four cases of neonatal acute infectious peritonitis from different causes that were examined for the coagulation markers TAT, PIC, t-PAIC, and sTM. The gene discussed is PLAT; the disease is Sepsis.