I am not in a position to FIRE yet...so, I will share my experience with changing jobs...it may be of use.
I think that there are three parameters to any job: People, Work, Money. It is rare to get all three right but I have found that if you did not have 2/3 right, then life is hell...and I look at ways of getting out. For example, I have worked in places where {people+work} were good and money was bad. I have worked in places where {work+money} were good and people were bad. Any job starts with a set combination of {people, work, money} and had a way of changing when people leave, company focus changes, company has money issues, etc etc. I have changed jobs to maximize money, work and people and in my experience, I have found that getting great people factor is the hardest to get right. I now have {people+work} good but money bad.
So, if you are feeling like FIRE, then I would recommend that you do a couple things to vet this feeling out...this prevents regrets later in life.
+ Which of the three factors {people, work, money} are good for you now? Are all three good? If not, then see if you can change the optimization factor. If work is not good, try changing that.
+ You have a good reputation inside the company...so, asking for a role change and getting has the best chance inside your current company. Give it a shot here.
If you still feel like you want to FIRE, then so be it. I found in my own life that from school to college to grad school to first decade of work, things are pretty much planned out for you...it is usually a combination of society, peer group, your past, etc. But, after a while, there is no roadmap...one had to form a new map. I have found that we can find new maps by meeting different people, finding out different work opportunities, taking a break, etc etc. It is a natural cycle of human life...your conscience is telling you something. Just honor is by experimenting with things part time until you find something you like. Then you can take the plunge into the new direction. If you are financially sound, then it is of great help in this exploration.
PS: Two points about the baby:
+ It seems like the baby is your whole world right? And it also seems like you are the baby's whole world too right? The former will stay more or less the same, but the latter will change when the baby grows up and goes to pre-school, has friends, etc.
+ As a mom, you may be feeling guilty about something w.r.t the baby. So, I would recommend exploring what that is...if it is spending time with the baby, try to allocate more time; if it is sending the kid to day care, try to get the kid out early some days, if it is not feeding home cooked food, try and allocate time for more home cooked food.
+ I.e. vet the feelings more.
Hope that helps. Pardon me if I overstepped the bounds in anyway.