Jo can say "Mama," and I think he means me. It's fine if he calls us both Mama at first (Co is Mommy), because it takes longer for kids to learn to say "Mommy." But for now, he does seem to be looking at me when he says it.
We did a lot of planning and talking about what he would call us. But I was unprepared for the magic of hearing my name in his sweet little voice.