Both of us want to have kids

We have kids already from previous relationships

You will need to appreciate the responsibility and financial cost of having more children. Having previously had children, you probably already have a realistic view of what taking care of a child means. You also need to understand that the current children may not automatically accept new children into the family and so you need to discuss this with them and answer any questions or concerns they may have. It is not unusual that they may feel that they will be left out or lose out on parental attention. There is some truth to this in that there is only so much time in the day and it has to be divided between all the children. A newborn requires a lot of time and attention and so your children may not receive as much attention as they do now.

Be honest with them about this but reassure them that you love them and will make time for them. Keep an "open door" policy where they can come talk to you whenever they need you. There will inevitably be some bumps along the road but being flexible and open will help you through them. what if i cannot physically have kids.

It is not unusual nowadays that a couple may decide not to have any more children and one of the parents may have tubal ligation or a vasectomy done. After divorce, you and your new partner may wish to have children. If one or both of you has undergone one of these sterilization techniques, this will present a problem. Reversal of these techniques is not guaranteed. Good medical advice and counsel is critical.

You need to understand the chances of a successful reversal and start to think about alternatives such as in vitro fertilization, using a surrogate or adoption if they are available to you. These options can put considerable strain on a relationship especially if failures mount up so make sure you are both very serious about your relationship and accept that you may not be able to have children of your own. It is good to bring this issue up early when a discussion around having children first comes up. You do not need to blurt this out on a first date but as your relationship gets more serious, you will need to bring it up.