For us, DW stayed home for the first 2+ years, which meant a "cost" of her salary (minus the 3 months paid leave). That would be ~$60K of lost wages, offset somewhat by the lack of childcare expenses.
Now, DD is in daycare and DW is back to work. For us (LCOL), daycare is $750. We're very lucky -- even in our area that's low, but our university has a great "teaching" daycare on campus. And health insurance doesn't cost any more for us with her. Again, we're very lucky -- as a married couple both of whom work for the state, our family health insurance plan cost is $30 per month (the same as our couple plan did).
In terms of other stuff, we did cloth diapering (now we're doing pull-ups, because that's what the daycare requires) so that was some initial outlay, but we got virtually all of them second hand. DW also breastfed (still does, in fact). We spent a tiny bit on formula to supplement when DD wasn't gaining enough, but that's it. Now, we're starting to notice her in our food budget. :)
We intend to do public school, and depending on what we're doing with our jobs, that might mean some aftercare, but I believe it would be in the $50-100 range. And we plan to be quite modest in club / sport / activity participation (more for scheduling than for financial reasons).
In terms of vacations, our budget will go up a bit, but we already tended to do a lot of hiking / camping (or renting cabins). We'll continue doing that. If we fly, we need an extra ticket, but so far we've always used miles. With one kid, we intend to get one hotel room when we stay in hotels.