Swaddling clothes?

So last week... or the week before?? Anyway, poor little Luke was exhausted and simply would not go to sleep. He usually sleeps on his tummy and does pretty well with that. We couldn't think of anything to do to comfort the kid. Finally, I decided to try swaddling him. He hasn't been swaddled since he was a couple of weeks old, however, it put him to sleep immediately! It was kinda funny (or at least, it is now...). "They" say not to swaddle babies regularly after a month or so (cause it messes with their motor development), but man, it was nice that night!