In the only observational study evaluating other than GCK-MODY variants of monogenic diabetes, the median GA at delivery in women diagnosed with HNF1A-MODY was significantly lower compared to GCK(+) individuals—39 weeks [38–40] vs. 40 weeks [39–40], respectively, (p = 0.02) [17]. Here, HNF1A is linked to diabetes mellitus.