We note that the common fetal variant rs1801282 in PPARG, which is associated with type 2 diabetes risk in adulthood58 via a fat distribution-mediated form of insulin resistance59, is weakly associated with lower birth weight (p=0.0259)5 and was not associated with gestational duration in a fetal GWAS of gestational duration in 84,689 individuals (p=0.487)60. This evidence concerns the gene PPARG and type 2 diabetes mellitus.