I recommend the dreamland baby swaddles. I have a 14 week old as well and once she turned 2 months I switched her to a transition swaddle and they have been Amazing!
@Allison yessss i used these too for the transition period and I would leave one arm out then the other. 1 week in between the two
We used the halo swaddles with arms out then slowly loosened the tightness of the band over like two weeks and now he does great in sleep sacks
I did it really slowly, one arm just during the day, then at night. Then two arms for the day and now all the time both arms. Was a bit hard at first for the night sleeps as she knocked her dummy out a lot but she’s getting the hang of it