Changing babys sleeping schedule

abigail

My son is 7 weeks as of yesterday, for the past two weeks he has been going to sleep every night at 12 am and will usually stay asleep for 4-6 hours, wakes up for a feeding and goes right back to sleep. I think that in the near future, when i return back to work it will be a problem that he goes to sleep so late. Do any of u mommies have any advice/tips for me on how i could change his sleeping schedule? I feel like he’s already gotten used to it