"MAMA"

My baby is 8 months and 14 days old as of now. Nakakagaya na siya ng ilang words like,wawa (lola) ,toto (tito) and some more, but she never tries to mimic when we teach her Mama or Mommy. And the worst thing is , she's going to laugh at me na parang nang-aasar when im theaching her to say mama. Can some of you relate to me? Have you experienced it as well??