She just smacks herself in the face and her startle reflex is still quite strong so she’s wakes herself up. I will try 1 arm x
It won’t happen overnight unfortunately, you just have to keep going and have a few bad nights before they get used to it. My boy is 9 weeks and has a very strong startle reflex still but I’m able to put him in a sleep bag now, he was in a love to dream swaddle before x
When I unswaddled my daughter I did it one arm at a time, let her adjust to having one arm free then did the other. It was 8 years ago so my memory isn't great but I don't remember having too many issues, just made sure to give lots of reassurance as soon as she started fussing