As a student of linguistics at Georgetown University, Speers was curious to see if a fabricated language like Klingon would be more or less difficult for a child to learn than a real language that might actually come in handy later. He also insists that he isn't a hardcore Star Trek fan while maintaining a straight face, which must have taken a heroic effort considering he admits to owning a Klingon costume and being the only person in America trying to raise a child to be fluent in Klingon in the same interview.
Maximilian Reininghaus viaWikipedia
"What's weird about this? Those are back scratchers."
To be fair, it's not like the kid won't learn English -- Alec's mother refuses to speak to Alec in anything but English. So, in theory, the child will be fluent in both, and Speers insists it's no different from teaching a child Spanish. However, when you consider that there are almost 500 million Spanish-speaking people in the world today, and approximately two dozen Klingon speakers, some flaws in Speers' reasoning become immediately apparent.
Like the fact that Klingons and children don't mix very well.