I need help with baby sleep problems!?!?

Well, I know it's extremely hard and seems very cruel...but you should really let him cry. If you know that all of his needs have been met, and it's time for him to go to bed then he will learn eventually to fall asleep in his crib. Trust me, it doesn't take a long time for this to happen. He has learned that he gets his way if he is crying. You are right that this needs to stop now before the new baby comes. I don't know if you put music on for him, but this helped both of my boys fall asleep. You might want to try that. Good luck, it really is the best way to get him to learn to fall asleep when you put him to bed.