I put 5+ on mine because I wanted it to be clear that I was open to many children. Personally I want at least four. There are many practical reasons why that is a good number for a family. Playmates for each other, as they get older they can babysit their siblings, recycled clothing and such (get your money's worth out of those baby items), you aren't left alone when your first child goes off to college, and you can help build the catholic church. That being said, I know that God has a plan, and I trust that he knows what's best.
I don't like to see "don't have an ideal" on the child question because I wonder if that means that they haven't thought about it, or if they have what their thoughts on it are. I think CM asks for and IDEAL because it is trying to determine more about what you want and who you are, less about what you will get. I put what I wanted, not what I expect.
All that aside, I don't judge a person by what they put. If they put 1-2 then it opens up a discussion. If they are adamant about only having a few, I want to know the reason.