who bath's him? do you bath him of a night?

I believe it needs to be done in stages if you want DH to do more of the daily task's to increase their bond. Start with the bathing before bed, and a book/bottle.... maybe both of you do bed for a bit, and you go out for a minute, come in... go out.. come in... do it in stages??!! while DH is in with him the whole time.. make sense???

He isnt going to just instantly take to DH doing something if you have been the only one to do it...

But its worth a go if its what you want. One thing you will learn is all you can do is TRY TRY TRY, try anything you think would work for you, give it a go and then see if it works for him.