There's really no reason. That's just how big it is when there is nothing inside of it causing expansion.
When your stomach is completely empty, they say it is the size of one of your hands balled into a fist. But it expands a lot when you eat.
A cat's stomach changes its shape and size according to its fullness. Empty, an adult cat's stomach is about the size of a small human fist. It stretches as the cat eats.
Yes. When it is empty it is about the size of your fist and when it is full it can be as large as a gallon jug.
The size of your stomache is the size of your own fist.
size of his/her fist
A persons stomach is normally about the size of their fist.
2cm
The size of your fist.
A newborn's stomach is only as big as his/her own fist
It is slightly smaller than your skull.
When empty, it's pretty small - about the size of a closed fist.
About the size of 2 average children fists.