Randi Zuckerberg knew her second son wasn't progressing as quickly as his brother, Today reports.
But she ignored her doubts, since he was a happy little boy -- until one day last April, when she clicked on Facebook's "On This Day" feature.
An old post popped up in which Randi had described all the words — and even sentences — her older son was saying when he turned 18 months old. That's when she knew her intuition had been right: something was wrong with Simi. "That was the moment I knew I needed to seek professional help."
It turns out Simi had hearing loss caused by an unresolved ear infection.
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