Congrats, Bearflag, that’s great.
Little girls are like little boys, only easier, quieter and they break less stuff. They love for you to read to them, take part in their tea party and lay next to them at bedtime until they fall sound asleep.
You’re in for a real treat.
Congratulations!
There seem to be a whole bunch of us on the SDMB who are either pregnant, or whose wives/SOs are pregnant. My wife is due with a baby boy in December. It’s so exciting!
Whose is it? ;p
(Just making fun of you for saying your wife is having it rather than both of you.)
I’ve got a baby boy on the way.
Clearly, you’ve never met my sister.
If I take my wife at her word, then it’s either mine or some odd scientific anomaly.
Or my younger daughter. 
And who could blame you? Still, it never hurts to start 'em off on the right track! 
Let’s see, our son likes to draw, isn’t into sports, and is pretty laid back.
Our daughter can quote you chapter and verse on the Ohio State Buckeye Football team, and has been winning medals in judo.
It doesn’t matter that she’s a girl. What matters is she’s yours.
AHHH! Waitresses Earworm! Damn you!
Girls are just like boys, except they’re missing the dangly bits. My girl is into Pokemon, Bakugan, Hot Wheels and stuff like that. But she also likes pink and every animal in existence. She also loves Def Leppard, Alice Cooper, Little Big Town, Kellie Pickler, Taylor Swift and Debbie Gibson. Thank God she doesn’t like Hannah Montana. She thinks bugs and spiders are really neat, and she thought it was so cool when she saw some fish eating a dead one in the fish tank. Her brother started crying and walked off.
The point: you never know what they’re going to like. Just encourage and enjoy them. Congratulations!
Oh, and read read read to her. Instill in her an obsession for books that will never go away.
I’ll second that. Reading is a gift that will always be treasured.
I wondered if anyone would pick up on that. 
I’ll echo what others have said: don’t sweat it. When I was a kid both my sister and I enjoyed wrestling with my dad. And when I dissected an earthworm in 7th grade, I kept jabbing at it with my dental pick and going “cooooooool” while my male lab partner squealed “don’t poke at it!!” and hid his face. Invite her to do things you like, and show interest in things that she likes.
I’ll also agree with the posters that have mentioned reading. Read to her when she’s real little, and get her to read to you when she’s old enough to learn. And keep books in the house! Not just kid stuff, but the things that you and your wife read; she may start getting curious about what it is that grownups read. She may even like it.
And congrats!! Have lots of fun together.
I’ll read her SDMB. 
One day at a time, and never assume you can guess today by yesterday. My little girl who wore dresses to play in and for every day but one in Kindergarten grew up to play tough volleyball and pitch with a deceptively easy motion that didn’t show the speed. Of course, she still runs like a girl. Played with toy horses and got insulted when her coach insisted on calling the high school team Lady Rockets.
It’s a mixed bag, I tells ya.
Oh, and congratulations.
I have three daughters, ages 22, 18, and 9. No sons.
Here’s how it’s gone:
Daughter one was something of a ‘girl’, liking dresses, lacy stuff, getting interested in boys very early (in fact, married a few months ago!), etc. Went through “let’s shock the folks” periods of: bisexuality (didn’t shock us); homosexuality (didn’t shock us); Wicca (didn’t shock us); ‘alcoholism’ (didn’t shock us too much); ‘drug addiction’ (didn’t shock us too much); ‘I’m suicidal’ (freaked us the first couple of times); ‘my bf is abusive’ (freaked me the first time).
Basically, notwithstanding the fact that she’s female, she’s also bipolar and borderline personality. What the female part doesn’t explain (which is quite a bit), the bipolar/bpd part explains pretty darned well.
Daughter two, very much a ‘girly girl’. As a little girl, she would not wear jeans; would not allow herself to be ‘dirty’ (to the extent that spilling a drop of her juice on her shirt at dinner was unacceptable; I took to keeping a spare shirt for her in the dining room!) As she grew, she was into Barbie, online paper dolls, etc.
At 18, she’s in college. She certainly wears jeans (hardly wears anything else!) but, the nail polish, socks, hair band, T-shirt and earrings must color-coordinate! In fact, she paints her nails every third day, the whole time, planning what she will wear the next several days that will coordinate. . .
Daughter three, well. . .she does enjoy putting on ‘girl clothes’ sometimes, like for church or something. But, at age 9, she’s just as happy playing with her snakes (she has three of them), playing in the dirt, figuring out ‘geek’ problems, bowling, roller skating, and playing video games.
Every time I was pregnant, hubby hoped we’d have a son (not gonna happen; I’m pushing 50 pretty damned hard). But the youngest is so much like her father that I often refer to her as ‘the son you always wanted’!
In short, there is very little you can tell by the gender, except what kind of ‘talk’ you’re eventually going to have with them!
Best of luck!
I think it’ll be pretty obvious. My daughter is 2.5 years old, and very active. She’s fun to play with, and into some girly things. I don’t think there is much difference initially boy or girl they’ll probably dig Matchbox cars and My Little Ponies both.
Just make sure you and none of your well-meaning but misguided relatives say things to her like “Oh, honey, you can’t play with that, that’s for boys,” and you’ll be fine.
Seriously, though, we’re just like little boys. Let her guide you to what she’s interested in and take off from there.
Yes. I’m thinking of making sure she plays in the dirt a lot to prevent onset of princess-ness.
Congratulations to the Bearflags.
If you love your baby, and that should be easy, for a number of years you’ll be THE perfect father. And she won’t be born with prejudices about boy/girl roles.
Now, she may develop into a girly girl, but by then you’ll know her quite well and both you and her mother will have adjusted.
This is such a time of joy, don’t waste any of it worrying about stuff like that.