After struggling two months of struggling with sleep (getting only 1-3 hours of sleep per stretch), I finally broke down and bought a weighted sleep sack. My baby only sleeps well when being held, so I was hoping the gentle weight would help. And it did! We started getting 3-5 hour stretches. After a couple weeks, I ended up buying 3 more of these (1 in the same size and 2 in the next size up).