Kudos to you and your husband for starting to save now. Here are a few expenses that took us by surprise:
MEDICAL EXPENSES: Your baby will have multiple visits to the Pediatrician during his/her first year. Depending on your insurance the co-pay can take a toll.
DIAPERS: If you choose to go the disposable diaper route they are expensive. I suggest doing research on the best value diaper out there.
LOSS OF TIME: This one was probably the one that hit us the hardest. A new baby cuts into free time. Gone are the free hours to plan, prep and cook meals or comparison shop for pricier items. A new baby becomes costly because you start paying for convenience. Your takeout expense line sky rockets and you buy items that are easy to find rather than the least expensive option. I wish someone had told me the cost of lost time so I could plan for it ahead of time.
Good luck with your pregnancy and baby and keep saving.