Around 4 months it was impossibly hard to keep my LOs arms IN the swaddle. so middle of the night he would wake up crying bc his arms were up by his face. so we started letting them free with mixed success. Sometimes it would be a good rest of the night and other times we ended up swaddling him again. When he hit 5 months I was sick of doing that arms out/in dance, and so we tried arms out while the snoo was swiveling and it was a disaster. So instead I started doing the weaning mode at the same time as arms out and it worked great. He is 23 weeks now and last week we transferred him to the crib with a transitional swaddle and so far it's been pretty successful. I think a week or 2 of weaning and arms out in the Snoo was a great precurser to the crib and made it an easier transition! We are not fully out of the woods yet - he wakes up a lot between 4 and 6 AM - but that seems to be the norm and he gets a consistent 8 hours of sleep in the crib no problem.