7 weeks old sleeping for less duration during day time

Hi Mummies, My 7 weeks old baby boy sleeps for very less duration in day time. On some days he will sleep only for 15 mins to maximum 1 hr and will get up on its own. So far he has been sleeping for 4 hrs stretch in night time Is this normal ? I am worried that he is not sleeping enough. He is active overall and plays as well. #firsttimemom #firstbaby #pleasehelp