In general, household chores are greatly underestimated. It takes an enormous amount of time to run things properly in a family. It is not the most important thing to have a precise 50%-50% division of all the household tasks. Many couples resolve to share child care and household duties as fairly as possible after birth. In general, research seems to indicate that the woman does a little more at home in the household as well as with the baby anyway.
It is important that it is divided in such a way that both parties can live with the division.
Possible tips might include making a list of household chores before the baby comes and dividing them. Get this list out from time to time after the child is born. Does anything need to change in it? Is a reallocation needed. Again; how does one handle the differences? Maybe one is more quickly satisfied with how clean the house is, but the partner is more critical. And KNOW: there is a difference in "performer" and "owner" of tasks. Sometimes the person vacuuming is not 'the owner' of the vacuuming and has a different idea of what good vacuuming is. The owner is the one who indicates that vacuuming is needed. Who may be more likely to see that it is needed. The performer does it. Sometimes the owner of the task is also the performer or it varies greatly by area (taking care of children, finances, chores on the house, etc). In any case: there is quite a lot involved in running a family!
The online Parents Inc. course focuses, among other things, on maximizing cooperation in the household.