Makes little noises at night

So my little guy sounds like a lamb in his sleep haha and he loves sleeping in his swing or the bassinet that came with the pack n play.. My mom suggested putting him in his crib and I said well I won't hear him wake up to feed then. I do have a monitor I can use but it makes me nervous putting him in his crib. He's so tiny and he seems to like to sleep on his side sometimes when I do put him in his crib. My mom just suggested it so his little noises won't wake me but at least I'd hear his cries to feed and I'd wake up. He will be 3 weeks on Friday. When did everyone transfer their little one to their crib? Oh and I don't use bumpers and I don't have blankets or stuffed animals in his crib. I'm very cautious about sids 😳