We’re calling it! T’s first word is “bubble,” pronounced “ba-buh” or “ba-bwah.”
I wrote here about how we weren’t sure if T’s attempts at “bubble” counted as a word. Since then, T has started pointing to the bottle of bubbles and shouting “ba-buh!” to get us to blow bubbles. It’s clear that he’s trying to say “bubble,” and he’s matching the first consonant and first vowel, and he’s trying to get us to do something, so we’re counting it as a word!