Get ready to have your mind blown. This is Brooke Greenberg, the world’s first 20-year-old toddler… God bless her little heart! Her freakishly rare condition has experts stumped at to why she simply stopped growing as a baby.



The most prestigious medical institutions in the U.S. can’t figure out what is keeping Brooke from growing causing doctors to moniker her condition Syndrome X.

A leading doctor in the field of Multiscale Biology at The Mount Sinai Medical Center in New York, explained that,

‘no apparent abnormalities in her endocrine system, no gross chromosomal abnormalities, or any of the other disruptions known to occur in humans that can cause developmental issues.’


Despite her increasing in age, Brooke has remained a toddler in stature, with a mental age of a one-year-old.


Brooke and her family appeared on “Katie” where family members pushed her around in a baby stroller.

Her father said,

‘From age one to four, Brooke changed. She got a little bit bigger. But age four, four to five, she stopped.’


All this and more on this episode of Katie.