how to get baby to lay by himself ? especially during the day

my son is 3 weeks old and i can’t get him to lay by himself. i have a swing he doesn’t like it, bobby lounger and doesn’t sit in it very long. his bassinet is also a no go unless he falls asleep with me and then i transfer him into it.

he likes to suck on his fingers so when i do snuggle him, i leave his hands out.

when he was born he had a really bad swollen head so he refused to lay on his back. i lay him on his side and his stomach at night.