I'm no expert but with your situation, I believe I would stay with what you have.
I just recently quit my FT job to go into Lawn Care, However I hated my job and my wife also worked there so I kept the Insurance.
Take some time and think about what you will give up(Job Security) And what will you gain (Possibly 50~60K maybe more)
Will your wife go back to work? Does she have Ins.? A baby is a very expensive addition to a family. I would really consider this very hard....If it were me........I would stay right where you are.
Hope this helps