OK, so I finally sat down and tried to come up with reasonable guesses as to how much all these upcoming expenses are going to cost us, and exactly how much we have available to spend. Here's what I came up with (keep in mind all but three smaller amounts are guesstimates):

EXPENSES
Pay renter to stop check: $30
Dental checkup bill: $226
Gum infection followup appt: $145
Dental surgery & followup: $600
AA & SL birth certificate copies: $52
AS birth certificate copy: $15
NT summer class tuition & fees: $2,707
NT/CJ tax prep & taxes: $600
Dermatologist appt: $139
Extra grocery money (we already spent all our Apr 1-15 money): $150

TOTAL UNBUDGETED UPCOMING COSTS (ESTIMATE): $4,664

ASSETS
Budget surplus: $1,432.80
AS/CJ skip haircuts: $40
Check from AS's birth father: $30
U.S. portion of EF: $4,398
Medical EF: $2,550
Amex gift card: $200
MasterCard gift card: $100
CJ medical flex spending acct: $154

TOTAL ASSETS: $8,904.80

So, if I subtract my guesstimated expenses from available cash assets, we have $4,240.80. That makes me feel a LOT better, because some of these expenses may end up being more!

Of course, not all the assets can be applied to just anything. For instance, I can't use gift cards to pay taxes, or flex spending to buy groceries. So I'll break down the assets and expenses into categories to see what the surplus is in each category.

MEDICAL COSTS:
Dental checkup bill: $226
Gum infection followup appt: $145
Dental surgery & followup: $600
Dermatologist appt: $139
MEDICAL ASSETS:
Medical EF: $2,550
CJ medical flex spending acct: $154
SURPLUS: $1,594

RETAIL COSTS:
Extra grocery money (we already spent all our Apr 1-15 money): $150
RETAIL ASSETS:
Amex gift card: $200
MasterCard gift card: $100
SURPLUS: $150

CASH-ONLY EXPENSES:
Pay renter to stop check: $30
AA & SL birth certificate copies: $52
AS birth certificate copy: $15
NT summer class tuition & fees: $2,707
NT/CJ tax prep & taxes: $600
CASH ASSETS:
Budget surplus: $1,432.80
AS/CJ skip haircuts: $40
Check from AS's birth father: $30
U.S. portion of EF: $4,398
SURPLUS: $2,496.80

So, this looks pretty good. I feel like I can relax while I have the next 10 days off work to help look after SL!