A dose of codeine brings relief from pain only when the liver metabolizes a fraction of it into morphine. Six months after Tariq’s death, Koren obtained a sample of Rani’s breast milk, which she had kept in her freezer. “This was the first time in history that a baby was reported dying from breast milk.”Koren had long studied the transmission of opioids into breast milk. “This terrible tragedy should never have occurred, and I am determined to see that this does not happen to other children,” Rani said. “I am quite sure that quite a few of those were codeine in breast milk.