1) How much do you have saved for emergencies? (3-6 months of expesnies is recommended)
2) How much have you saved for retirement and how much do you plan to?
3) Do you plan to save for college?
4) How easy is it for your type of job to leave and return after a period of dormancy?
5) How many hours are you and your DH away from the house ?
6) Is there any possiblity of reduced hours or part time?
7) How flexible is your and your DH's current job? Could you stagger your hours for a while, if you are worried about leaving the bay for long periods of time.
8) Could your DH take paternity leave?
I usually suggest people live on one person's net salary (less 401k deductions, taxes, healthcare deduction....) for six months banking the rest (except for childcare). That way they can see if they can actually stick to it and they have a nice nest egg for emergencies.
Note that nannies cost about 2.5 times what good daycares cost after you add in everything. Plus, your food budget will only increase from here on out - sometimes exponentially

.
If is more about extending your maternity leave a few more months - see if you can do that - maybe work into it be going back part time at first.