The effect of caffeic acid on the fetus weight, placental weight and placental index of streptozotocin (STZ) induced gestational diabetes mellitus (GDM) induced rats at end of the experimental study. A, fetuses weight; B, placental weight; C, placental index. Dunnett’s multiple test was performed for the statistical analysis. Treated group rats compared with the STZ induced GDM group rats. *p<0.05 consider as the significant, **p<0.01 consider as the more significant and ***p<0.001 consider as the most significant.