Difference between Mummy and Mumma?

Mummy I used to call
To whom I was born.
All the things she gave me:
Sacrifice, love, devotion, affection and tears
All these she spent on me throughout 12 years.
And
Mumma I used to call
To whom I loved very much, my doll,
DOLLY

All the things she gave me:
Sacrifice, love, devotion, affection and tears
All these she spent on me throughout 2 years.
I was in the Impression
That I can’t live without both,
Now, both are no more in my life
And still I am alive.

By: Mahfooz Ali