Ah this is good to know! We also have that arms up swaddle - I will give it a go!
We really struggled getting our little boy used to no swaddle. We use 2.5tog sleep suits now rather than sleeping bags and that's really made a difference. I guess in the swaddle they feel nice and warm and then the sleeping bag doesn't keep their arms warm. Loads of cheap ones on vinted!
@Adele that’s a great idea! I will have a look!
We tried ours out the swaddle at 15 weeks and it didn't go very well, he has such a strong startle reflex! We have a love to dream arms up transition swaddle, now he's 16 weeks I'm going to give it another go x