I, too, was SHOCKED by the extreme fussiness. My babies were so happy most of the time. But in the evenings they, and particularly the younger one, would get so upset that I would sometimes start checking them for injuries. Had I accidentally sat on a foot?! Was there a random, unexplained sore somewhere?! No. It was just normal. There is a theory that babies simply cannot control their crying because their nervous systems are underdeveloped. Now when they cry like that I know they are tired and am able to get them to sleep most of the time. So perhaps they were just tired then and I had no idea or they just simply couldn't get to sleep. Just keep in mind that it doesn't last long. Soon she will find happy moments in the evenings and between feedings and then those happy moments will stretch out and you'll suddenly find yourself sitting next to her on the floor while she happily babbles and kicks her feet for an hour or even longer!