Pros: I will say that when my daughter got too big for her swaddling sleep sacs and her rock n play this was magical, it did help with both transitions and she did sleep mostly through the night. I liked it so much I got the next size up. I will also say, you need to do what you gotta do to for you and your baby to get some sleep. Cons: 1) It's basically a snow suit, so it's WARM, we keep our house around 68 degrees at night so it was OK for our house, but it could get too warm for your baby. 2) It keeps them from moving freely, which sometimes ment it calmed her down, but I think other times it really upset her, until she just sort of gave up? 3) You will need to wash it at some point in time and it will shrink, HARD. The other part of that is you then will be without a suit while it's drying (air dry or line dry only, don't dry it with heat, you will never get it to stretch out enough again), and if your baby is reliant on it you're out of luck. 4) you will eventually need to transition out of this, and that can be interesting, ours happened because it was coming into summer and also because she managed to completely roll over in it. She had a hard time adjusting to being so free in her crib. 5) I do think it may have slowed down her progression a bit. Since we stopped the sleep suit she has learned to crawl and scoot and sit up from laying down all in about 3 weeks, and I feel like that's huge compared to her movement progression while still in the suit.