Crazy Baby!

I don't know what to do with this baby in the evening. He won't go to sleep lately and just cries no matter what. He's been up for almost 4 hours! Thats crazy! He's too young to be up that long. I feed him. I change him. I try swaddling him and rocking him. Nothing works on cranky baby. Try letting him cry it out but that can go on for hours! Then if he should fall asleep as soon as I put him down he wakes up and loses it all over again! Ahhhh!