Well, the increase in income and the loss of that child care deduction could have knocked you into a higher tax bracket, that's one possiblity. Really the only way to know if your taxes truely went up is to figure out you effective tax rate, which is dividing you tax (line 60) by your AGI (line 37) for this year and then compare it to last years.
If you do find it went up, I'd take a look at your AGI and compare it to the tax brackets, again you may find you got bumped up into the next bracket.
Married Filing Jointly brackets:
10% $0 - $16,700
15% $16,701 – $67,900
25% $67,901 – $137,050
28% $137,051 – $208,850
33% $208,851 – $372,950
35% $372,951+