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do you notice what makes tummys go up and down?

Issue
i have a 5 year old friend named rob he lets me feel his tummy go up and down what makes tummys go up and down

Best Tip

he contracts his diaphragm which makes it seem as if his stomach is going up and down.

Others
what the..... hell?
the muscles in his stomach is contracting
when you breathe... your diaphragm expands and contracts... which makes your belly go out and in
With inhalation, the descending diaphragm drops inferior to the inferior margin of the ribs and invades the abdominal space causing the "stomach" to extend outward.
Duh, are you really that stupid or are you just checking to see if someone gives you a stupid answer??