guilty mommy

I have two daughters. One just turned 10 on December 13 and the another just turned 1 on December 28. Since going back to work back in April after being on leave with my youngest, I find myself feeling more and more guilty about having to work. You would think I should be use to working full time since I've been working since my oldest was 3 months old and the the longest break to took away from work was when I had the baby. But I'm actually beating up myself more now than I did with my oldest. Could it be because I keep telling myself I don't plan on having anymore kids and because of that I will not be able to witness any firsts I have missed with my two? My husband is trying to find a job where he can make enough to support us so I can be at home and finish school. Sorry for the long post. I just needed to vent.