How old should a child be before they can remember the lyrics to the song "Whoot! There it Is!"?

My 18 month old has the chorus down pat but when I try to teach him the lyrics of the song itself, he seems very distracted and just looks at me drooling a lot. Eventually he just throws out the "Whoot, there it is!" but I am worried he might be developmentally disabled. Should I be concerned or is Hip... show more My 18 month old has the chorus down pat but when I try to teach him the lyrics of the song itself, he seems very distracted and just looks at me drooling a lot. Eventually he just throws out the "Whoot, there it is!" but I am worried he might be developmentally disabled. Should I be concerned or is Hip Hop a bit advanced for a child his age?
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