My husband has bi-polar and it is bloody hard work at times.
He takes his meds like clock work and they work well for his mania but no drugs or therapy have ever made much of a difference with his depression so he is pretty much always depressed now and his social anxiety is through the roof. He has been on meds for over 20 years and this has been the best cocktail for him so far but we have lost hope that any meds will do much for his severe depression. Trust me, he has tried pretty much all of them at this point.
When we had children it was harder for a while because any big change in routine will make him worse but thankfully he carries on with this treatment.
I also have OCD and health anxiety. It is very normal for people with mental health issues to have bad spells when a big life change has taken place, you may find that after a few months he becomes a bit better.
I love my dh to bits and can't imagine a life without him but it IS hard work and sometimes I get sick and tired of it, but because he is always trying to push himself and takes his medication I can take the bad times, if he didn't take his meds or made an effort then I couldn't remain married to him simply because I refuse to live with someone with a severe mental illness which affects me if he couldn't even take his medication. Same goes for me with my illness.
Try to remember that having a baby is hard on a man too so he might just need some more time adjusting and within time things might get easier again.
The best thing I have found is to not let his illness stop me doing what I want to do. I wish I could have more of a social life with him but that isn't going to happen but I make sure I still have one and when he is severely depressed I have to work very hard at not letting his mood rub off on me.
My husband is a wonderful, loving caring man and it breaks my heart to see him suffer so much, but I am human and at times I need to detach a little for my own sanity.
If you want to talk then feel free to PM me. I have OCD so have a lot of experience in that department as well.