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Why many words if few okay?
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I forget exactly which book it's in, but a psychologist was working with a kid that was adopted from an orphanage in an Eastern Asian country. The orphanage was so understaffed that the babies there got almost no interaction with adults and ended up creating their own way of communication with each other. It was just basic sounds but the one for a caregiver that would go around and change their diapers was referred to as "ma" or "mmm", can't remember which.
I believe the book was either "The Boy Who Was Raised as a Dog" , or "The Body Keeps the Score."
Edit: The book is "The Boy Who Was Raised As A Dog" chapter 10. There were a couple dozen words the babies/toddlers made up, the one for adult/caregiver was "muh". >

In Japanese it is "haha". Which is basically fitting into the a-scheme. >

It's still "mama" in Japan.
Haha is like saying "mother" if comparing to English, which a child wouldn't typically call their mama that, especially at that age >

Mama is a loanword imported from Europe. Mom in Japanese is oka-san.
It’s said that mom was just “kaa” but was eventually added “o” as an honorific. >

Well yeah. But mama is what's used in Japan. >

It's an import >

Everyone is saying the early stage word for mother would be haha or okaasan, or mama.
The actual word is kaa かあ
It's actually still used in Tsugaru dialect.
かっちゃん、かあ、おっかあ
This is the Yamato-kotoba version of baby speak for Mama. >

M is absolutely not the easiest phoneme to pronounce. It's one of the latest that children develop outside the big 5 >

Yup. Usually the words for father are much easier to pronounce >

The only difference in "mama" and "papa" is a very slight timing shift in when you turn on your vocal chords and whether you've closed off your nasal cavity with your soft palate. >

There is basically no difference between M and N if you don’t actually open your mouth to let the sound out. We typically describe an unpronounced N as M however.
Again, “Mmmm, that looks tasty.”
Tad Dad Nad
Pad Bad Mad
There are only two mouth forms here. The rest is determined by when your vocal chords are turned on and whether you allow air to exit through your nose. If you hold on the N in Nad or the M in Mad, the sound is effectively identical. >

M is not the easiest sound and most kids don't say Ma first. 
Weird to make up facts and call it a shower thought. There's a ton of science on this >

M is one of the first sounds made once a child figures out how to use their vocal chords. You can argue that a "raspberry" is a series of the letter P. Sure, that comes before M. You also get a lot of TH and S sounds earlier. "Ththsspppt!" comes before "mama".
We focus on M because it's one of the first vocalized sounds. Think about saying "Mmmm" to something that smells good. That's not an M in the phoneme-as-part-of-a-word sense, but it's one of the first vocalized sounds a baby makes. It's just a closed mouth, a relaxed soft palate to enable breathing through the nose, and a vibration from your vocal chords. >

That's an interesting observation! It looks like babies are pretty smart when it comes to language development after all. We should all take a page out of their book and try to simplify our language too! >

Why waste time say lot word when few word do trick