A teenage mother in Florida is accused of killing her infant son after she allegedly tried to calm him down with a bottle of baby formula she believed was laced with cocaine but contained fentanyl.

The incident occurred June 26 at the pair's Callahan residence, where authorities discovered the now-deceased 9-month-old lying on the living room floor, according to a report.

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He was rushed to the hospital, where he was declared dead, and the corpse has since tested positive for fentanyl, according to Nassau County Sheriff Bill Leeper.

"Originally, the mother said she didn't know what happened," Leeper said. "She put the baby to sleep and just couldn’t wake him up."

However, when a July 10 coroner's report revealed the presence of fentanyl, the 17-year-old mother changed her narrative, the sheriff said, and revealed how the drugs entered the baby's bottle.

"The mother was tired and wanted to take a nap ... so she gave her baby a bottle and laid him down in his crib to take a nap," Leeper said.

"Now, it's normal to give your child a baby bottle when they're tired," he added. "What is not normal is what the mother put in the baby bottle to get him to go to sleep. She got the baby's bottle, filled it with formula, then went in the bathroom and found a pill bottle ... with what she thought was cocaine.”

She just wanted her son to take a nap, "and he never woke up," according to Leeper.

The story is beyond tragic, he said.

"Every now and then, something does happen that you really can't explain, you can't make up, and you say to yourself, 'What in the world were they thinking?'" Leeper said, "It just breaks your heart."

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The mother, whose identity has not been released, is facing aggravated manslaughter and possession of a controlled substance charges, the report noted.

A 2023 study from Families Against Fentanyl revealed that children 14 years old and under represent the fasting growing age bracket of those dying from fentanyl poisoning.