As others have said, until they can rollover you can do it, it's only then it becomes an issues.
My LO is strong and I know rolling over will be coming in the next couple months, so I just started trying to ease toward breaking her of it. I just started swaddling her with one arm out for 1 nap a day. I will move onto more naps, then two arms out, ect as a way to ease her out of it. I would rather ease out of it, then stop it cold turkey and have a couple hellish days of no sleep, as my LO absolutely loves it, and loves to be tightly wrapped.