Hi! My DS2 is also 4 weeks. He is my third child, so I totally relate to needing him to sleep in his bed!! I just don't think it happens that easily. I use the moby wrap or sling to ensure a good nap. I feel like my other 2 learned around 8-10 weeks to put themselves to sleep, so I pick my battles. That being said, I always try for a nap in his bed. I usually hold him for 10-15 min when eyes are closed before putting him down in his bed. Mine wakes up at 45 minutes, so I've been putting him in the wrap to finish the nap. I'm constantly reminding myself this is only for a short season they are like this, needing us so much, do am trying to enjoy it. But it is a difficult stage. Best of luck, you are not alone!!