In her interview with Anderson Cooper Beyonce says Blue Ivy is the reason she was put on this earth...
Beyonce tells Anderson,
"[Having a baby] just gives you purpose and all of the things that my self-esteem was associated with, it's all completely different."
"I realized why I was born and more than anything all of the things I want to pass onto my child and the best way of doing that is not by preaching or telling her but by showing her by example which is one of the reasons I'm here."