My own mom calls herself that way "mahmah" to my LO. Haha... I'm not sure how I will feel if it's my MIL. But.. if nothing can be done, I think you can ask your LO to call you Mommy (different from MaMa), or you can keep emphasizing to LO and refer to her that she is "Ah Mah". e.g. this is Ah Mah, Ah Mah is here to see you, Ah Mah is carrying you etc. I'm quite sure LO can differentiate the calling in future.
Is it Cantonese’s ma3ma3? It’s sounds very different than normal mama
Anonymous