Swaddle arms out transition

Lou Lou

Any advice on transitioning from a normal swaddle to swaddle with arms out? My little man has slept in a swaddle sack for the last 10 weeks, but is now waking himself up fighting the arms in. We can hear him struggling to get his arms free. He went from sleeping in a 7 hour chunk to waking up a few times a night fighting for his arms.

Thank you in advance!