I have two DSs aged 6 and 5 months. Whenever DS wants anything "fun" he goes straight to DH. Whenever he wants anything like a snack, or he wants to be in a mood or complain he comes to me. Even if I am all the way on the other side of the house and DH is right next to him! DH does more than his fair share of household stuff - I do all meal planning and cooking but he does all laundry, most of the cleaning, bin stuff, cat litter emptying, keeps on top of most of elder DS's school stuff. So I feel I can't complain. But I don't know if he understands things like how if he wants a shower he just goes and has one - I have to say, please can you take the baby while I have a shower. He gets to relax in bed at night whilst I get woken 10 times by the baby (EBF, velcro baby) who I usually end up co sleeping with so I can't even get into a comfortable position. He can say, I'm just popping to the shop and go whereas I have to pre plan everything because the baby is a milk monster and won't take a bottle. When I have a break from the baby it's often to do something like cook a meal or do some other household job.
I don't really know if I'm explaining myself very well but I just feel mentally I'm the default parent and I find it exhausting even though DH is supportive, kind, and does a lot more than a lot of other men do (appreciate that bar is very low).