Naps in crib

How do I get my lo to take naps in his crib? Our fault but we always just let him nap in his swing, so he still does but he’s 9 months so he’s starting to kind of grow out of it. He’s only napped in his crib a few times. He goes to bed in his crib just fine. Right now I gave him a bottle, put his lullaby music on(he always listens to it when he goes to bed) I’m trying to wait but I hear him crawling around and babbling. And he is most definitely ready for a nap. Advice/tips?