I had this EXACT problem with sophie around the 2nd month as well. I think this is the time where they are trying to get used to sleeping longer through the night. I called that time the "Withching Hour", because all she wanted to do was cry until about 10:30pm and then sleep. So here is what I did but ,again, all babies are different so I cant promise anything.

1.) Do you have a mobile in the crib???
I noticed that we didnt have a mobile and when we put it in Sophie would just stare at it and it would help her to fall asleep.

2.) Colic drops??
We used to put gripe water in her nightime bottles and it would help a little bit with the reflux

3.) The good old bounce around!
We used to put her in a football hold facing us with and then we would bounce her as we walked. She would fuss for the first couple minutes but then she would pass right out!

After a couple weeks it will pass... its not that your overfeeding. Some babies just have a hard time digesting there food and at about three months there stomachs get a little bit more comprable.

Hope this helped!!! ))