CST4 and Hypocalcemia: Laboratory examination before delivery revealed that compared with the control group, insulin treatment significantly decreased prenatal TG (Z = −10.392, P < 0.001), cholesterol (Z = −8.494, P < 0.001), low-density lipoprotein (Z = −3.918, P < 0.001), apolipoprotein A1 (t = 2.410, P = 0.019), cystatin (Z = −4.195, P < 0.001), incidence of hypocalcaemia (P = 0.036), and absolute number of lymphocytes (Z = −3.426, P = 0.001).