Women who did not complete the prenatal follow-up (n = 112), who developed pregnancy complications (preeclampsia n = 39, gestational diabetes n = 25, or gestational hypertension n = 14), took medication (insulin, metformin, steroids; n = 10), or who did not have B12 or folate measurements (n = 63) during pregnancy were eliminated from the analyses. Here, INS is linked to gestational diabetes.