hi, i posted 'can someone help me with my fidgety 6 mo old please!'. and am going thru the same thing.
my son uses the miracle blanket as well he will be 7 months on the 16th. he is very fidgety and would scratch his ears, eyes, everything. he also is now rolling over which is making it difficult to swaddle. i have still been using the miracle blanket, however, the past two nights i have gotten him to go to sleep in only his baby-gro. he does still wake up, he always did even with swaddle, he gets thirsty, etc. i think he is very slowly getting better. he was getting to the point where he did not want to be swaddled, this just recently, whereas before he would go straight down after his bath and swaddle.
at 15 weeks, i would say dont worry and keep swaddling. im only trying to stop now cause he will be 7 mos and is rolling over quite a lot. he might still be swaddled again who knows, but these two nights are a major breakthrough. id say keep on swaddling until they can really roll over and actually roll over in the swaddle like mine did and/or they make it obvious they dont want it anymore. hang in there!!!!