Why did the toy company start making curvy Barbie dolls?

Apparently parents want children to have dolls that look their daughters. I had Barbies but when I had them I didn't have any curves , just like any average 10 year old girl. I also don't have my middle and ring finger fused together like Barbie. I understand wanting to make dolls of the same skin color, but seriously there is only one woman on Earth that looks like a Barbie and she paid a lot of money for plastic surgery to look that way. She looks ridiculous and should have spent money on her mental health.