Sleepy baby

Ok so my son is doing great sleeping during naps and at night but the last couple days he has been super fussy and tired! Like he napped for 1.5 hours and he woke up and was so fussy and tired and than right. Is 630 he is super fussy and tired so I put him in his crib I feel it's a bit to early but he seems so tired lately. Has anyone's baby done this act extra tired for a couple days? Did you put them to sleep earlier? I don't know if I'm doing the right thing