OP, I don't think anyone was being snappy with their comments, infact some have given really good practical advice as to how they plan to make it work during mat leave. I think there were just a few details missing which might help people give better advice in the original post.
E.g. Have you arranged to take mat leave with work already and DH isn't aware of this? In which case people might be able to help with how to approach it with DH.
Has DH arranged to take mat leave through his employer? Therefore will there be issues with informing employers of change of plans etc.. Which people might have experience of and be able to help with.
Has no official mat leave been 'arranged' at all? (I mean all the paperwork and document filling etc...) which gives you a much broader choice of options to look into over the next few weeks and more guidance which could be given.
For what it's worth as soon as you set a mat leave date with work they have to assume you will be absent for 52 weeks unless you inform them otherwise, so you do have time to sit down with DH and organise how you feel returning to work etc...after baby is born. Like a PP said you might want to go back part time or stay home with DD/DS. I think you need to give your employer 8 weeks notice to return to work so you don't have to decide anything right now in terms of letting them know. E.g. My mat leave starts on 12th Feb and is down on paper as a full 52 weeks, work know I intend to return after 9 months but HR have told me they can't put it in writing before I actually go off and then give official notice to return. It also gives me a bit of freedom to change my mind. 
Depending on your DHs work situation it might be more difficult for him to arrange to take some of the leave due to time frames, but I'm no expert at all. I'm sure someone else will have much more experience of splitting leave and the logistics behind it.