Factors influencing blood glucose in infants included sex (P < 0.0001), BMI (P < 0.0001), glucose GRS (P = 0.0031), and the genotype of the T1D susceptibility gene insulin (INS) (P = 0.00048) for preprandial values and sex (P < 0.0001) and glucose GRS (P = 0.0088) for postprandial values. Here, INS is linked to type 1 diabetes mellitus.