[DDAmasa]

I wouldn't worry about your son calling his foster mom "momma". It's normal at his age for a child to call everyone "momma" or "dada". They simply can't say much else. These are the first words most children start to say. And they have no idea what the words really mean. They usually connect them with people in general, but not with specific people. My son called me, my mother, my sisters and my nieces "momma" until he was over 18 months old and could finally start to say some other words. It doesn't mean anything. It's important that he be able to call her something and it's not so easy to teach a child that age other words. I'd cut her a lot of slack on that.