It's normal passing phase although its a pretty long phase. I read about something call evening fussiness when baby for no reason, will cry n fuss from evening until they fell asleep. Mine started at week 3 n gradually got better until it went away at 5 months. during that time, hubby n i took turns to rock him in his fav position. he will cry if we dont do that. He will fuss from 6pm-midnight or 1am. But when he sleeps, he can sleep well but wakes up 2-3 times for milk n fell back to sleep immediately after feeds.