Hi G.,
This is a tough decision you are facing - I'm sure one that feels like there is no good answer to. I work full time as well, but I was able to "rethink" my career and reinvent it into a job I could do at home with my kids - let's think outside the box here for a minute and see if we can come up with some ideas for how you can use your education, keep a career you enjoy, contribute financially to your family, and be with your baby more. For example - have you researched if there are different ways to use your nursing education, like say in some sort of a consulting role, where you wouldn't actually need to be in the hospital/doctor's office to use your expertise? There may be companies out there that could uses your perspective as a nurse in product development, etc. Or, if something like this isn't possible, could you do part-time for a bit, or job-share?
I know these may not feel like viable options right now, but sometimes if you allow youself to think about what would be the perfect job for your situation, instead of simply the career path you are currently on, new doors and windows open.
Nursing is an ideal career - you are in high-demand - so if you were to take a risk and try something different for a bit, I bet you could land another nursing job in a heartbeat.
I hope this helps, hang in there and just know that I completely understand what you are going through, and it will be OK, whatever you decide to do. Your baby will be in good hands, and you will give her everything she needs.