When my ds12 was born, I stayed working, but my employer at the time allowed me to adjust my hours to leave a bit earlier each day. We were very lucky as far as child car goes - my in-laws watched ds for us. Dh is a teacher, so summers were covered. Fast forward 4 years later to when dd8 was born. My in-laws were now watching my ds (who was now 4 and in preschool part time) and my niece who was 15 months old. We were toying with the idea of me staying home so as not to burden my in-laws with a 3rd child, but I too was really scared to make the leap - especially looking to the future when I'd have to go back to work and whether or not I'd be able to find anything.
I finally asked my father in law how he would feel about watching a third child- and I wanted honesty. He told me at the time that his doctor told him he needed a break. That was the deciding factor and I did quit my full-time job. It was very hard telling my boss - I worked in a non-profit Association that only employed 6 people and we were like family, but she understood.
I was lucky enough at the time to find and get hired for an 11 hour per week job at our local library as a clerk. I wasn't looking for it at all, but when I took dd to story time, I saw the posting and decided to apply - more for me to just get out of the house a few hours/week.
When dd8 went to kindergarten, I was still working at the library for those 11 hours. I also, for the heck of it, applied for a 25 hour/week job at our local Housing Authority and got it. I loved the library, and didn't want to quit it so, I was then back to working 25 hours at the Housing Authority and 11 at the library - almost full time - all within a block of my kids' school. It wasn't even the plan for me to go back to work until dd was in 1st grade, but I felt that I had to take the opportunity - especially given the job market.
Now fast forward another 2 years, which puts at last October. The full time librarian that managed our branch decided to retire. I was hired to replace her. I quit the Housing Authority and am now working at a job I love and within a block of my kids' schools.
It turns out that in the long run, quitting to become a SAHM was the best thing that could've happened for us. Did we have to pinch pennies a bit more for those 5 years? Yes, but it was so worth it and it all worked out in the end!
Sorry for the lengthy post and best of luck in your decision!!
