Love to dream do newborn sleeping bags/swaddles x
Tommee Tippee do really good swaddle bags, I used them with my first and using them again this time around You can use them with their arms out or there are poppers on the arm holes you can close so you can use them as a swaddle as well which we found really useful I bought them from Vinted they are quite pricey new
We used swaddles until he started showing signs of rolling around 4 months, and then switched to sleep sacs. Kyte Baby has been my favourite sleep sacs for softness, but we have used other cheaper ones that are good as well. Amazon has a good selection
They have sheets that have swaddles connected it velcros over baby you could try those! I believe they have them on Amazon