Congrats!
can't say anything about babies or prenatal phase, but just love your child, read downtown jr. stories/help little downtown learn to read, take little downtown to play in the park and go to any museums, and support whatever (s)he finds interesting!
you know how important it is to instill the idea of reading/learning to be fun for children early on.
Congratulations.
Kennigit's advice above is excellent. My parents were great believers in reading, and I often had more books in bed with me than I did teddy bears.
My dad was very supportive of what I found interesting. The two of us spent a lot of time on holidays going rock-hunting and beachcombing, and around home he bought me a telescope and we spent time outside watching the stars. He'd also help me with homework, from basics like "Daddy, I just don't get how to write the letter 's'!", to teaching me a way to tie my shoes that actually worked for me (I don't do it like most people), and on up to college when I was having trouble with the math part of one of my physical geography labs.
If your baby turns out to be a girl, don't just leave it to her mom to teach her things and play with her. Kids want attention and companionship from both their parents (although not always at the same time).
Do either set of grandparents live within a reasonable distance? It's important to maintain that kind of relationship as well.
Don't talk down to your kid(s). Give them age-appropriate explanations, but never assume they're too young to understand something if they want to know about it.
And never lie to them. If you do and they figure that out, you'll have damaged their trust in you. At some point, they'll wonder what
else you've lied to them about.