Character designers learn how to exaggerate a cartoon character's proportions so they're unbelievable enough to have visual appeal but believable enough that audiences will actually care about them.
This exaggerated anatomy has shaped the iconic look of cartoons to the point where we can't imagine toons without noodly limbs, giant heads, ridiculously large shoulders, preposterously tiny waistlines and great big eyes.
But if these same proportions were applied to living people the results would be horrific, as the simple acts of looking, walking, lifting, standing and giving birth ravage bodies too imbalanced to function properly.
Their brains would struggle in vain to process all the information presented by their big eyes, their noodle arms and legs would make movement and muscular exertion of any kind excruciating, and don't even get me started on giant toon heads and childbirth...
Read 6 Unintended Consequences Of Cartoon Character Design here (NSFW language)