Yes, two little girls definitely use that hand-on-chest gesture in the Seven-Up! clip. Isn't that fascinating?
I learned British (deaf) sign language to Stage 1, and one is encouraged to gesture in addition to the recognised signs, to aid communication. So rather exaggerated facial expressions and body posturing are used to emphasise meaning.
African women often clap once to express pleasant surprise, but men never do that.
Greeks lift their chin to express 'no', but it can look as if they're nodding in agreement.
And Indians wobble their heads to show agreement or thanks.
I'm just wondering if there are natural universal gestures, or all of them are learned and cultural. If one watched babies, one couldn't be sure they weren't copying their own parents' gestures.
I believe the Italians have a myriad gestures for various situations. Didn't the 'cuckold' two-finger pointing (index and little finger) originate there? And the elbow-flex with clenched fist (a sexual reference).
This is all very, very fascinating!