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In this work, we first propose the isovector $nD^{*}_0(2400)^0$ molecularstate to explain the enhancement structure around 3250 MeV ($X_c(3250)^0$) inthe $\Sigma_c^{++}\pi^-\pi^-$ invariant mass spectrum newly observed by theBaBar Collaboration. Under this molecular state configuration, both theanalysis of the mass spectrum and the study of its dominant decay channel canwell depict its resonance parameters measured by BaBar. Our investigation alsoshows that the isovector $nD^{*}_0(2400)^0$ molecular state can decay into$\Sigma_c^{++}\pi^-\pi^-$, which is consistent with the experimentalobservation. These studies provide the direct support to the isovector$nD^{*}_0(2400)^0$ molecular state assignment to $X_c(3250)^0$.

New structure around 3250 MeV in the baryonic B decay and the $D^*_0(2400)N$ molecular hadron