Congratulations! We have an older boy & younger girl, too (6 & 2 1/2). They're the best of friends--and that tiny little thing will probably become quite the tomboy, that's what Gillian does. She copies her big brother and is absolutely fearless.
Best of luck to you--a new life is so incredibly special, so beautiful. :)
Hope you're getting some sleep.... doubtful! ;) ^