Montelongo et al. [22] examined PRL levels in 12 women with PGDM (n = 10 T1DM and n = 2 T2DM) and found these to be non-significantly different from those of non-diabetic control women, either during lactation (at 2–4 weeks postpartum) or later, after cessation of lactation. Here, PRL is linked to type 2 diabetes mellitus.