A friend of mine married after a 3 month engagement and a huge fancy church wedding. 6 weeks later he was filing for divorce. I asked him what went wrong with his marriage. He said, "It went on too long."
A few years later, he married again. It's 30 years later now and he's still with her and happy.
There are no exact time tables. You have given up a lot and invested a lot. So now the question is: How much more do you want to give up and invest?
You have a child and that is an important bond. Remember that how you interact with him will be what your daughter learns to expect or how your son thinks a man should act with his wife.
Jane Wyman, Ronald Reagan's first wife said she divorced him because he was "boring." So if you decide to cut your losses,and split, you'll be in good company; Wyman was a fine and successful actress.
Best of luck whatever you decide. These situations are never easy.