Sleeping help

I’m a first time mom, my baby is about to be a month in 2 days and he was sleeping pretty good at night the past 2

ish weeks he would knock out at around 11 which is usually the time I would sleep but for the past few days he’s up until 4am and is up 2 hours after and I want to try and bring it back to how it was but he sleeps all day I try to keep him awake but especially after breastfeeding he is out. Any tips how to lessen the naps during the day and switch it around

Thanks in advance!

Baby smiling at a early morning burping session