At the 3rd trimester of pregnancy, low-normal FT4 concentrations were associated with depression (Pedersen et al., 2007) while, at postpartum, data on the association between thyroid hormones and depression are equivocal (Ijuin et al., 1998; Kent et al., 1999; Bloch et al., 2003; Albacar et al., 2010; Sylvén et al., 2013). This evidence concerns the gene TG and depressive disorder.