Santa's 'Say mama' is well known. I have done a analysis of a child who says 'mama' . No more. Like extending a rubber band I have streched out the horizontal axis which is time. You can also hear the four steps, whereby you need little patience. In the last histogram, every swinging parts of your mouth
mama.wav
聲道：1
類型：wav
analysis、speech、voice、say-mama、word
分析、言語、語音、說，媽媽、字
資料來源：freesound ( https://freesound.org )