One month will not stay asleep

My one month old baby recently for the past couple of days will not stay asleep. She use to sleep through out the day every 2-3 hours. Recently putting her down for her naps have been hard she’s been very fussy and seem to be crying for no reason and methods of soothing sometimes works and sometimes it does not but it takes a very long time. When I put her down to sleep she’ll sleep for an hour or 5 minutes it all varies but it’s less than an hour and it’s been happening all day and all night. Her schedule has tremendously changed out of nowhere was is the cause of this?