My 13-mo-old says Dada consistently for Daddy and says mum mum for food (Chinese baby slang for food) but not Mom. He says baba every time I say Mommy or Mama. It's not like he doesn't have the M sound so I don't know why he wouldn't call me Mama? Any ideas why?i was worried that it would be something wrong with his hearing but since he says mum mum consistently, it shouldn't be the case.