So he's on his way to sentences, making up small ones now. You have to discount the extra tatatas after each word and you can usually understand what he's trying to tell you.
"Eta Babuta bagtata" -- This is Mum's bag.
Which brings me to the point of this post: so not only am I no longer Emm, nor am I Ma or even Mamma. When we went to Madras last month, he discovered that I call my mum Mamma, so he started calling her that. To add to the confusion, there was also in residence his mama, my brother. In all, he could throw a car and hit a Ma, Mamma or a Mama. Which, of course, he did quite a lot. He also threw everything else he could pick up, mostly out of sheer joie de vivre, from what we could tell.
Anyway, to distinguish me he began calling me by my endearment for him, Babu. Which worked fine until we came back home and he discovered that he was in the middle of Baba (Vicky), Babu (me) and Baby (him). Probably giving it up as a bad job he's stuck to this nomenclature ever since.