These swaddling blankets are an absolute must for new parents. I purchased one on a whim while pregnant with my daughter and by the time she was a month old, we had bought 3 more! They have velcro tabs that allow you to safely and securely swaddle your child without having to worry about the possibility of a blanket coming loose and being a safety hazard during sleep. Even in Florida, my daughter wore the fleece ones to bed for months and months. She slept through the night from about 11 weeks on, which we attribute in large part of the effectiveness of the SwaddleMe sleepers. Even the grandparents learned how to use them for the times they babysat.
For parents who aren't familiar with swaddling, these are a great alternative.