It is noteworthy that there was a significant interaction effect between mothers with the presence of A allele in the genotype of OXT_rs4813627 and the absence of clinical postpartum depression (Chi2 test, p = 0.019), indicating that the presence of A allele in the genotype of OXT_rs4813627 could be considered a protective factor (Table 5 and Figure 6). The gene discussed is OXT; the disease is postpartum depression.