It has only been 2 years. That seems like a long time but really it isn't. It might take several more years before he decides he is ready to watch you come down the isle.

Sure you want to be married but think about what is important. You love him, you have him with you and you two have a baby. Sure it is nice to have that final stage of commitment but considering what you have, don't mess it up. I am sure he wants to be with you, he is there after all. Getting married is a big step, even though you guys are pretty much already living the married life I can tell you from experience, getting married even when you know you want to and wouldn't want to be with any other woman on the planet is still one heck of a nervous experience. It is pretty common for people (both men and women) to change their minds several times along the way.

My advice, cherish what you have already and then just keep in mind where you want things to go. Show him that you love him, remind him why he loves you and he will come around. It might not be tomorrow or next week but it will happen.