What would you do if you want 3rd kid but your spouse think that 2 kids is enough. We've already discussed it but it seems that he's not budging. I can't seem to change his mind.

Why do you want 3 kids? And why does your Husband not want it? Have You thought of the practicalities of having 3 kids? Space at home? Car seat space? Who will help you, etc? Jumping from 2 to 3 is a huge step, and You need to Ensure you are financially and emotionally prepared for it.