Baby Sleep Sack Tips That Actually Made a Difference

I've noticed that baby sleep sacks seem to be one of those things parents either love or skip completely. Some babies seem to sleep longer with one, while others don't seem to care at all.

I'm curious about everyone's experience. Did a sleep sack actually help your baby sleep better or feel more comfortable? Did you have a favorite material or thickness for different seasons?

Also, when did you decide it was time to stop using one? I've seen so many different opinions that it's hard to know what works best.

I'd love to hear what worked for your family, what didn't, and any tips you wish you knew earlier.