From the dawn of time, or at least from the dawn of when someone decided it was a good idea to give a mom a smartphone, every mom has held their phone the EXACT same way.
In the words of immortal Robert Stack, "Join me. Perhaps you may be able to help solve a mystery."
It can't be explained.
It's like an episode of Black Mirror except it's just 60 minutes of moms using a phone.
Mayhaps you have an answer?
Mayhaps you can help?
Mayhaps we can solve this mystery.
Is it because the phone is too heavy?
Is it because they can't see the phone?
Why so gentle?
Why so careful?
Mayhaps this is one of those mysteries that remain UNSOLVED.