We started using this sleepsack when baby was 6 weeks old, so it's been a week now. WE LOVE IT! Baby panics when he's swaddled so we just leave that part off. Baby went from a nighttime cycle of sleeping 2hrs, waking to eat and staying up for an hour, repeat...To sleeping 3-4 hours, waking just to eat and then going RIGHT BACK TO SLEEP! Also, and this is even more important, he sleeps on his own on his back. Before this sack every time I put him down he'd cry, so he just slept on my chest (which...