Blood 1,25-DiOHVD is often elevated in infants with MBDI. Elevated blood 1,25-DiOHVD levels cause increased bone resorption and decreased bone mineralization, and thus this finding is not unexpected since all infants had evidence of healing rickets on imaging studies. These results indicate blood 1,25-DiOHVD should be done in contested cases of child abuse in infants with MUF as an elevated level indicates bone fragility.