Aww he’s still too small to have any kind of routine and at that age doesn’t understand the difference between night and day. Lean into the chaos and take any help you can. If you have help, get them to watch your lo while you catch up on some zzz during the day and take shifts with your partner if you can. you’ve got this and remember this too shall pass. (Not so comforting at 3am when they are screaming) xx
Just watch for his queues, lower your expectations of what you can do and sleep whenever you can. Sorry that's not what you probably want to hear but he's just working out not being in your stomach. It's easier to surrender than try to fight it