Our bank went over our expenditure with a fine tooth comb.
Including childcare/private health insurance/school fees/holiday expenses everything.
My kids will probably cost us over a $1,000,000 to get to 18 if we take into account not only the expense of having them but also my 'lost' earnings/effect on DH's career etc.
That is the way it goes. We decided that having them was better than having more cash.