Bernie Sanders: 'Bernie Baby' Dead

The 4-month old infant who was famously known as the "Bernie Baby" on social media ... has died from Sudden Infant Death Syndrome.

Oliver Jack Carter Lomas-Davis's mother Souxsie says her son died on February 25. She made the sad announcement on Facebook.

Oliver became a phenom when his mom dressed him up in a wig and glasses to look like Sen. Bernie Sanders and posted the pic online.

The senator actually got to meet his youngest (we're guessing) supporter a few weeks ago during a rally in Las Vegas.