Newborn Not sleeping more than 1 1/2 to 2 hours


My newborn is about 5 weeks and for the past few days has not been sleeping restfully. He used to sleep in 3-4 hour stretches and sometimes 5 hours during the days and nights now all of a sudden (past 3 or 4 days) he has trouble falling and staying asleep. He’ll breastfeed for 30 minutes fall asleep for 30-45 minutes and continue this all day. He hardly has good daytime naps & fusses in his sleep. At night the most he’ll sleep is 1 1/2 to 2 hours with a bedtime routine and everything. Has anyone had any experience with this?