How are girls different?

Rachael

I have a one and a half year old son, and I'm due with a baby girl in one month! I've heard from so many people that it's completely different having a girl. Are there any tips or advice for a first time girl mom? Anything I need to look out for that I didn't have to worry about with my boy? Anything I need to buy before she gets here that I didn't have to buy with my boy (other than the obvious stuff). Thanks guys!