Mama & Dada
You could have noticed already that almost all babies begin with the words "mama" or "dada". This is much to the delight of parents of course. Now, scientists found out why.
The study began by doing a brain scan on babies while they listened to make up words like mubaba and penana. They heard many words that end in repeating syllables.
It was then seen that the ability of the brain to recognize repetitive sounds is hard wired. Therefore, it is always suggested that "mama" and "dada" should be taught to a child repetitively.