Have a very frank discussion with both your direct supervisors as well as your HR dept. Most companies, especially larger ones (as I am assuming you are in a larger corporation as there is an application process here) have a plan in place to accomodate your needs as well as the company's. If you are in a position that will need to be filled while you are out, make sure there is enough time to train a temp.
You will also need to know what the policies are for post-delivery. How soon do you want to return? How will your child's needs be met while you are at the office? Can you return for partial days and ramp up to full status?
For me, I had different situations with each of my 4. Once I was allowed to keep my baby under my desk and breastfeed in the bathroom until he got old enough to stay awake. When I was in college, I had to redo a semester because the dates kept me out too long for credit.
at 12:14 AM on Aug. 28, 2010