Child Favoritism

Le
I am 15.3 weeks pregnant with my 2nd child. I was wondering for those mommies with multiple children, do you tend to favor one child over the other? 
Sometimes sibling rivalry exists and one child may think their sister/brother gets more attention or is favored by a certain parent. 
As a parent, do you ever find yourself favoring another child over another? And why? Please be honest as this is something I have been thinking about. Thanks for your feedback.