In my experience, it's been "daddy", then "mama", then "no" ... and then "mine!"
🤔 I don't get it.
Not the, it's usually dada.
Usually false. In any and all languages the "th" sound is extremely uncommon, english is one of the few languages that does have it, but even many english speakers replace the "th" with an F, T, or D sound. It'd be hard to believe "the" is any baby's first word.
Here I was, thinking it was "supercalifragilisticexpialidocious".