PurComfy Supersoft Sleep Sack 1.0 TOG, Premium Bamboo Viscose Baby Sleeping Bag 2-Way Zipper Sleep Sack Baby Wearable Blanket

You need to cold turkey it, but you can use a transition sleep sack like this one https://www.target.com/p/halo-innovations-sleepsack-swaddle-supersoft-viscose-from-bamboo-mauve-s/-/A-94728077 so they still have some pressure on them but it’s a sleep sack and their hands/arms are free. We also loved the Little Sleepies sleep sacks and the Bums & Roses sleep sacks. We also liked these https://a.co/d/0hyd0WjG .