Barth syndrome (BTHS) is one of the rare X linked recessive diseases that appear in infancy with a triad of myocardial and skeletal muscle diseases, neutropenia and growth retardation. The pathogenic variant of gene leads to BTHS, which encodes the TAFAZZIN protein of the inner membrane of the mitochondria, a phosphatidyltransferase involved in cardiolipin remodelling and functional maturation. We present a case of a neonate presenting with early-onset cardiomyopathy, neutropenia and failure to thrive with no family history of cardiac diseases. Echocardiography suggested a dilated left ventricle with non-compaction and a low ejection fraction. The baby was managed with diuretics and decongestive measures. Clinical exome sequencing detected a hemizygous novel splice site variant c.541+2 T>C in , confirming the diagnosis of BTHS.