These sounds are among the easiest to learn to make consciously. Press your lips together and hum, then open your mouth. That will make the “ma” sound. Close your teeth (or gums) with your tongue pushed forward and open them again, expelling sound as you do. That is “da”.
These two sounds are easy. It really is as simple as that. “Pa” and “ba” are also easy sounds, which is why they are strong contenders for parent sounds, too.
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