@Mars62312: I’m not a parent and have no intention of being one, but I think things that need to be discussed are:
Discipline. So many couples differ drastically when it comes to disciplining their children. Children need consistency, and parents need to present a united front, so it is SO important to a) agree when it comes to discipline and b) present a united front, and back each other up. On a similar vein, do you agree on what children should be doing around the house? Etc.
Childcare. Are either of you going to give up work? If so, who? Who will do the bulk of the childcare, or will it be split equally? Who will do the night feeds? Etc. Again, I see SO many parents not discussing this and it ends up breeding resentment.
How it might affect you as a couple. Will one of you feel bitter/resentful if the other has less time for them/is devoted to the child? How will you deal with this? How will you make time for each other?
Finances. Does one of you want to set up some kind of trust fund/savings account/college fund, and does the other think this is unnecessary and that children should fend for themselves as adults? Do you have similar ideas when it comes to other expenditures eg birthdays and Christmas? Etc. Finances also come into play in terms of affording a child: again, will one of you quit work? If so, can you afford this? How will finances work? (ie will the person staying at home still have full access to the account, or will they be given an ‘allowance’?..)
Religion. This will only likely matter if you are of different religions; however, it’s something you need to agree on eg if one of you is Christian and the other atheist, will you baptise your child? will they attend church? Will they go to a faith school? Etc.
Food. Is one of you vegetarian and the other not? How do you feel about processed food/fast food/sweets (etc)? This can cause big issues where one parents sees no problem with the odd treat, and the other thinks that children should never ever eat sweets/pizza/McDonalds, as one parent may end up gong behind the other’s back, which can cause tensions and give the child ‘leverage’ in arguments.
When it comes to pregnancy and childbirth, do you agree on the preferred type of birth? (eg is your OH totally anti C-section/Home birth whereas you’d like an elective C-section/home birth?) How do you both feel about breastfeeding eg do you find it icky, but OH is adament that you WILL breastfeed no matter what?
When it comes to TTC, do you agree on what you would do if you couldn’t conceive naturally? Some people are totally opposed to IVF, whereas others are all for it; and I’ve seen fertility issues drive couples apart time and time again.