Bah

Flynn's talking is gradually coming along, still a bit indistinct which requires some careful listening to work out what's going on for a lot of words.
The basics like boat, da, car, dog, duck etc aren't too bad now however we've worked out that Bah = Mum.
We've tried to get him to say mum (which he can do as we hear it when he's upset) but he just won't say it to Sandra.
The only thing we can think of is that due to us telling him where the baby is, he's now saying bah for baby but meaning mum?