2 Month Baby Not Sleeping

Hi mummies, my 2 month old baby doesnt sleep much in day or night... Day she will sleep while feeding... Night by 7 she will b cranky to sleep.. Sleep for 5 min then immediately wakeup.. This continues until 1.30 or later.. Then she sleepoff till 5 am..super tired as i dont have anyone to help. Any advise dear mommies..