I'm looking for a little guidance in what I feel is a very confusing decision.
I have a 27 month old and a 9 month old. I've worked in the financial industry for 10 years at a company that I'm proud to work for. Although I find the industry interesting, I've never felt passionate about my specific field. This has never bothered me that much b/c it's interesting enough and I see work as work and find my passions elsewhere. After the birth of my 1st I went back to work part-time (an amazing gig in this industry) and now work 9-5 M, W and F. I have a nanny that comes to my home. When I went back to work after my first maternity leave I had to switch jobs and was not thrilled with the position, but the arrangement worked fine and I was happy. After having my second baby, nothing has changed except that I now give my ENTIRE paycheck to the nanny. So I'm breaking even working. I stayed in the job as a way to keep my foot in the door b/c ducking out for years on end would be a career killer.
My nanny recently quit and this is making me reevaluate the entire situation. I'm weighing the fact that I don't love my job and am making literally no money and someone else is spending precious time with my kids against the fact that I'm afraid to give up the part-time arrangement I have b/c it'll be nearly impossible to find that again. My options are to quit and stay and home but dabble in consulting to keep my resume fresh (so I don't kill my career), or stick with the part-time arrangement for the long-term benefit.
What would you do? My gut tells me I want to be home with the kids, but I'm so afraid of such a huge change. My job/career has become part of my identity.
And here's some additional info I out up after I got some initial responses on the SAHM board: First, having a nanny in NYC for 2 children is less expensive than paying for daycare for 2 children. Second, if I quit I would find some way to keep my foot in the door - there is a demand for consulting/contract work in my field - so I'm not concerned that I wouldn't be able to get back in at all (or have to take a lesser-paying job etc), I just really worry about giving up the part time arrangement bc everyone tells me how awesome it is. I would hopefully be able to do intermittent consulting until I was ready to delve back in.
To give a little more color to the situation: we also plan on moving out of the city in 1-2 years at which point I'd be adding 2 hours to my day in a commute which would mean less time with the kids and I'd be in the red after paying that much more for childcare. So, I might end up quitting then anyway. Or maybe I wouldn't. Also, my growth at the firm has become a bit stagnant, maybe bc of the part-time arrangement, maybe bc of the new role I took on when I came back part time. I also know that on days I'm home with the kids I'm happier than days I'm working. I've always wanted to stay home with my babies, and I feel like this is such a short window of time when they're so young and I have the rest of my life to work. However, work is of course a nice break as well and I enjoy getting dressed up and having time to myself.
TTC in 2008. Stage II/III endo, Hashimotos hypothyroid, low morph (3%).
2 cycles Clomid/Ovidrel/TI/Crinone=BFN.
IUI #1 - 4 Follistim/Ovidrel/IUI/Crinone = BFN.
IVF #1 - Antagonist w/ ICSI 4/10. 17 retrieved, 5DT of 2, BFN 
IVF #2 - Long Lupron w/ ICSI 6/10. 15 retrieved, 3DT of 2, BFFN!!
Lap 7/21/10
IVF #3 - Clomid/Antagonist w/ ICSI 10/10. 14 retreived, 3DT of 3, BFP 10/20 but m/c. No HB 11/15/10 - D&C 11/17/10.
FET - 2 blasts, 1 survived the thaw. Transfer 2/19. Beta #1 3/1 375, Beta #2 3/3 885, Beta #3 3/8 4261, Beta #4 3/11 9005. U/S 3/8 1 sac 1 yolk, U/S 3/16 1 heartbeat 114bpm!
James born Oct. 24th 2011 via c-section at 38 weeks!

Surprise BFP - Jack born April 28, 2013 via VBAC after PTL at 33 1/2 weeks!

Re: Should I Be a SAHM??
I would probably have to take full-time consulting work for periods of time (like a 3 month contract). I would need childcare. But, I could do this once every year or two to stay current. There wouldn't be night/weekend work in my field.
I'm on my DH's benefits already. We could afford to put into my 401k what I currently contribute.
I'm already paying for my nanny to do classes/activities so I'd just take them over.
As far as non-domestic accomplishments, it's impossible to say how I'd feel but I think I'd be satisfied bc I'm not getting huge props at work on a daily basis.
My DH is encouraging me to quit. It's again impossible to say whether our relationship would change.
TTC in 2008. Stage II/III endo, Hashimotos hypothyroid, low morph (3%).
2 cycles Clomid/Ovidrel/TI/Crinone=BFN.
IUI #1 - 4 Follistim/Ovidrel/IUI/Crinone = BFN.
IVF #1 - Antagonist w/ ICSI 4/10. 17 retrieved, 5DT of 2, BFN
IVF #2 - Long Lupron w/ ICSI 6/10. 15 retrieved, 3DT of 2, BFFN!!
Lap 7/21/10
IVF #3 - Clomid/Antagonist w/ ICSI 10/10. 14 retreived, 3DT of 3, BFP 10/20 but m/c. No HB 11/15/10 - D&C 11/17/10.
FET - 2 blasts, 1 survived the thaw. Transfer 2/19. Beta #1 3/1 375, Beta #2 3/3 885, Beta #3 3/8 4261, Beta #4 3/11 9005. U/S 3/8 1 sac 1 yolk, U/S 3/16 1 heartbeat 114bpm!
James born Oct. 24th 2011 via c-section at 38 weeks!
Surprise BFP - Jack born April 28, 2013 via VBAC after PTL at 33 1/2 weeks!
TTC in 2008. Stage II/III endo, Hashimotos hypothyroid, low morph (3%).
2 cycles Clomid/Ovidrel/TI/Crinone=BFN.
IUI #1 - 4 Follistim/Ovidrel/IUI/Crinone = BFN.
IVF #1 - Antagonist w/ ICSI 4/10. 17 retrieved, 5DT of 2, BFN
IVF #2 - Long Lupron w/ ICSI 6/10. 15 retrieved, 3DT of 2, BFFN!!
Lap 7/21/10
IVF #3 - Clomid/Antagonist w/ ICSI 10/10. 14 retreived, 3DT of 3, BFP 10/20 but m/c. No HB 11/15/10 - D&C 11/17/10.
FET - 2 blasts, 1 survived the thaw. Transfer 2/19. Beta #1 3/1 375, Beta #2 3/3 885, Beta #3 3/8 4261, Beta #4 3/11 9005. U/S 3/8 1 sac 1 yolk, U/S 3/16 1 heartbeat 114bpm!
James born Oct. 24th 2011 via c-section at 38 weeks!
Surprise BFP - Jack born April 28, 2013 via VBAC after PTL at 33 1/2 weeks!
TTC in 2008. Stage II/III endo, Hashimotos hypothyroid, low morph (3%).
2 cycles Clomid/Ovidrel/TI/Crinone=BFN.
IUI #1 - 4 Follistim/Ovidrel/IUI/Crinone = BFN.
IVF #1 - Antagonist w/ ICSI 4/10. 17 retrieved, 5DT of 2, BFN
IVF #2 - Long Lupron w/ ICSI 6/10. 15 retrieved, 3DT of 2, BFFN!!
Lap 7/21/10
IVF #3 - Clomid/Antagonist w/ ICSI 10/10. 14 retreived, 3DT of 3, BFP 10/20 but m/c. No HB 11/15/10 - D&C 11/17/10.
FET - 2 blasts, 1 survived the thaw. Transfer 2/19. Beta #1 3/1 375, Beta #2 3/3 885, Beta #3 3/8 4261, Beta #4 3/11 9005. U/S 3/8 1 sac 1 yolk, U/S 3/16 1 heartbeat 114bpm!
James born Oct. 24th 2011 via c-section at 38 weeks!
Surprise BFP - Jack born April 28, 2013 via VBAC after PTL at 33 1/2 weeks!
I agree with the others who said that it sounds like you have made up your mind and you know what you want to do. If I were breaking even after paying a nanny, I would not work. I have a PT job, which is hard to come by at my level, so I understand the hesitation at giving that up. However, if you can part on good terms and do some occasional consulting work, then there's no reason you could not work PT again in the future. It also sounds like your DH is supportive and your financial situation will still be stable, so I see no reason not to SAH if that is what you want to do.
Just to address one of your follow ups regarding consulting work, if you are picking up three month projects and need childcare during that time, it is not that easy to just jump in and out of childcare so I would consider whether that is really feasible.
GL!
I would not continue to work if I was just paying my nannies salary. For you, I think you should quit and become a SAHM for a while. Sounds like that's what you want to do. I would DEFINITELY stick with the consulting though. It is not easy to get back into the work force after taking several years off.
I also agree with PP. I would make sure you continue to contribute to your retirement account and put money into savings.
I'm not the SAHM mom type, but I make much more than we pay out in childcare as well.