I swaddled my babies a long time too, because they slept better. I did it until it was summer and too hot. There is nothing wrong with it and it is not going to inhibit their develepment, if you are only doing it for sleep. Sure that could happen if you swaddle them day and night, but I doubt that is what you are doing. If you are ready to wean from swaddling, what I did was swaddle with one arm out only to start with, and then had both arms out. Also as I stopped swaddling I found he slept on his stomach more, so that lessened the startling yourself awake problem.