Sounds like it's a done deal and would work out really well for your family.

Just another thought - can you job share? You could at least do that to start with, even just one day or a couple of afternoons/mornings a week until DD is a little older (and therefore feeding well from a cup/bottle etc), you all get used to the arrangement and you get the hang of the job. Then, gradually increase the amount of time you work and decrease DP's?