A baby boy died after an untrained doctor pressed the wrong button on his bypass machine because it was a less "horrid" colour than the other, an inquest heard yesterday. Four-month-old Thomas Smith was on a heart and lung bypass machine when Simon McGuirk, a cardiac surgical registrar, accidentally turned it off. Mr McGuirk said that he did not know whether to press the orange or blue buttons to restart the machine, so opted for the blue. It sent the machine into reverse, sucking blood from Thomas's body. He died a short time later. The inquest heard that Thomas had...