So the ultrasound showed 'girl' and now I am nervous about how I am going to parent two little girls in a way that helps them grow to be beautiful, individual young women who can appreciate each other and get along together.

Logic tells me that I don't have a problem doing that now; after all, even if S and T were the same gender, their personalities are so different. I know that I use some different techniques with each one, and I cuddle them and read to them the same... I know that this feeling of reluctance is partly due to the whole "how will I ever love another baby the way I love the one/s I have?" that I felt before T was born, and partly (ok, mostly) due to the difficult relationship I've had with my own sister.

I want my girls to grow up without having constant competition over who's prettier or smarter or more talented. I want them to be friends and not rivals. I know that personality and their own choices will have a huge impact on whether that happens, too, but I want to establish some sort of fertile ground for a really loving sister relationship. How do I do this?!!