We sort of have a routine, at 3 weeks. He's been doing it naturally for a while now - feed and sleep (usually with fussing) sometime between 9 and 12 pm, then sleep for 4 hours, feed for 30 mins, sleep for 3-4 hours, feed and if I'm lucky sleep again. Last night he was asleep for 11pm, woke up at 3:30 fed and back down for 4am, slept till 7:30, fed then slept till 9:30.
Through the day he'll (on a good day) feed then sleep for 2hrs, and just repeat till bed time. Other days he won't settle and just power naps between feeds and fussing.
I actually got out the house today. Walked 5 mins to our local lidl, but got T in the sling, where he was comfortable enough to fall asleep, so I'm calling it a success.