How do you get your 5 week old to nap? Do you hold them or do you put them straight down?

I use white noise for my LO and try putting him in his Moses basket but he won’t fall asleep unless I hold him and bounce on the exercise ball. It’s also in the living room and I have a 5 year old also.

If I put him down whilst he’s asleep he wakes up not long after.

Is there anything I’m doing wrong or something I should be doing?