Oh, I didn't realise there were more posts on the next page 
Great news about getting an offer holls. Hopefully they up the offer for you. It's always hard trying to project what you will be able to afford in the future, especially with a new baby.
Maybe your DH grump is just because he wants to look after you and baby and he is worried about making the finances a struggle. I find my DH gets the grump often on things that, when we talk about then, are about his hunter-gatherer instincts wanting to shield me from all worry (which is never required, but he still always looks to protect me)
KitKat - Go out and do something else baby free instead. One of my favourite things is a walk around a garden centre and tea and cakes in their café. Whatever your thing is though - go for a run, have a massage, get a haircut, go shopping or window shopping.
Or, just hibernate upstairs with earplugs and a good book for a couple of hours quality duvet time.