Fussy time

I have noticed lately that Tyler has his fussy time early in the evening around 5 to 7 p.m. He would cry and cry even though we try to meet his needs like changing his diaper, feeding, and holding him. I tried the best I can to make him calm but sometimes it will take awhile before he finally calms down. Then after his fussy time, he would fall asleep and will be sleeping for 3 to 4 hours at night. He already established his sleeping time, he usually sleeps around 9 or 10 in the evening then wakes up around12 or 1 a.m. then I would feed him and he would fall back to sleep around 2 or 3 a.m then wakes up again at 5 or 6 in the morning. He is pretty good at night and I hope that he will continue to be that way.