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.

Try to find what there's a difference in your opinions. Is he worried about the financial aspect, which is a great deal in todays times. Men, in our society, no matter how feminist we sound in other matters, the onus of looking after the family's financial needs rests on man, so may be, he is worried about how he would handle all that. Try to figure out his concerns and if it's causing stress for him, it is better to drop the idea, and have peace at home. You guys already have two kids, focus on providing them the best of life.