Old post, but I'll still add if this could help someone. I am surprised to see that you did not even discuss children before getting married. Anyway, that stage has gone. You should have stopped at 2 itself.

You need to put your foot down. Ask her how does having 3 kids make the family small and 4 make it big, i.e big enough to be satisfactory ? If logic does not help, then go for marriage counselling. If that is too expensive, then put your foot down and tell her that she needs to be realistic. You have dreams too. If you have too many kids, then how will you get the time to pursue those dreams ? Tell her that she needs to consider your needs and aspirations too (i.e she is being selfish). Period. 

Now, I am not saying that your wife will do this, but it is a possibility. Some women will use sabotage to get pregnant and later expect you to not abort the pregnancy. A skipped birth control pill, poking holes in a condom, picking up a freshly discarded condom etc.

**Video evidence:** Ask Wendy show. I want another baby - 
http://www.youtube.com/watch?v=5CNHwhHWPoQ

You should also listen to `Tom Leykis`. He has a free internet radio show. **Although I don't agree with all his "teachings" about women**, he has just the advice to deal with the kind of woman you have for a wife. That is, the women who are selfish, unrealistic and do not respect the man they are with. Do not judge him by his looks. Listen to him and decide if his advice would be useful to you. Call him if you want. 

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  [1]: https://i.sstatic.net/BmWST.jpg