Bartter syndrome Type III is a rare autosomal recessive disorder resulting from 
an inherited defect in the thick ascending limb of the loop of henle of the 
nephrons in kidney. The typical clinical manifestations in childhood are failure 
to thrive and recurrent episodes of vomiting. Typical laboratory findings which 
help in the diagnosis are hypokalemic metabolic alkalosis, hypomagnesemia and 
hypercalciuria. We report a case of Type III Bartter syndrome not responding to 
repeated conventional treatment of failure to thrive.