<prompt> Gray baby syndrome is caused by -PenicillinChloramphenicolRifampicinErythromycin  <response>: Ans. is b i.e., Chloramphenicol o Chloramphenicol causes gray baby syndrome in premature neonates due to blockade of electron transpo in liver, myocardium and skeletal muscle. Remember o Chloramphenical is the most common cause of aplastic anemia. o Tetracyclines are the most common cause of superinfections. 