I never really gave this much thought. Barbie wasn't the catalyst behind my eating disorder, so never thought about her real proportions. But, I do know that a lot of young girls try to look like her. Why I'll never know. But, here's a good look at what Barbie would look like if she was a real woman.
I don't think any young girl would want to look like her if they saw this.
http://www.beautylish.com/a/vmaxj/what-does-a-real-life-barbie-look-like