My son is 5 weeks old and we have used the SwaddleSack for 3 night now. He has slept almost 6 hours straight each night since using the SwaddleSack. A feature I like is that my son has the ability to have his arms free but still be swaddled. The other swaddle product I’ve used does not offer that option and my son hated his hands all cooped up. And the main reason I tried this product was because of how soft the fabric is. I have used SwaddleDesigns blankets before and love how soft they were and this product did not disappoint!