Cannot recommend Baby Studio enough! Great service and great products. I have used their swaddle suits for my bub from birth. My daughter is nearly 4 months and I've just bought the 3-6 month sized swaddles as they are that good! She sleeps so well in them. She normally naps during the day for 2 hours (sometimes 3!) as she doesn't wake herself easily like she would if wearing other swaddle suits. And she normally only wakes once a night for a feed. Obviously every baby is different, but I truly believe that she would wake from day naps after about an hour if it wasn't for these suits! I think having a well-rested baby makes for a happy baby, and one that will most likely sleep better at night too! They are excellent quality and the fabric feels so soft yet firm (a lot better than swaddles in the same style from other brands - I've tried them all!). Thanks :)