5 weeks is really young. At this stage, you do what you need to do to get baby to sleep. They’re very prone to getting overtired at this stage, so get baby to sleep on time with whatever works. I started putting baby to sleep via patting after 2 months. Not foolproof, but the success rate’s increased dramatically (almost 4mo now), and she’s also learnt to self soothe sometimes.
All these require patience and time. But sleep training usually starts from about 4 months. Prior to that, start teaching baby the difference between day and night, and also establish a strict routine and bedtime cues. Those will help greatly:)