With DS1, DH was working a 9 til 5 job. DS1 had feeding issues to start with (tongue tie) and would feed for 2h at a time, so I would muddle through the day but asked DH to do the evening meal, which he did (mostly because he would have had to wait too long for his dinner if he'd had to wait for me to cook it some nights!)
I worked PT from home after DS1 was 6wo, but since DH wouldn't do any of the night work, changed very few nappies and never did bathtime, I suggested that it was only fair that he continued to cook dinner and clean up afterwards (he needed his sleep, apparently - seems he thought I had no need for it
)
Since we emigrated, DH's job has been home-office based, but sometimes with long trips on the road. We alternate cooking/ washing up etc. because it works for us. I haven't worked out here at all (can't easily) but that was part of the "deal" of us coming over here (DH is Aussie). I still do all the housework, laundry, cleaning and tidying - but the daily grind of the kitchen work is shared.
With DS2, he is almost entirely my responsibility again, as DS1 was - he's 1 next week and DH has changed a maximum of 4 nappies for him, done no night waking, no bathing etc. DS2 sleeps in with me so nighttime routine is all mine to deal with as well. However, DH has had to take on DS1's evening hygiene routine, so he's more involved there now.
I am not unhappy with the labour divide - I could wish that he would help more with the heavy work as I have a bad back and even vacuuming can set it off, but he generally does when he's asked, he just doesn't ever see that it needs doing without being asked.
He's pretty good really. :)