Was recommended to this product by a co-worker, and it fully lived up to the hype!  My twins are almost 4 months old and were getting too big for their rock-n-plays.  As we worked to transition them to their cribs, we were dealing with lots of broken sleep.  With the help of a crib wedge (which I highly recommend for anyone transitioning a baby from a rock-n-play and/or a baby with reflux - my twins had both) and these magic sleep suits, they both slept completely through the night (8:30pm - 7am) without waking up once!  We have also been using the suits to help nap train them successfully (these kids NEVER want to take a nap).  Honestly, this is one the BEST baby products out there - the gift of uninterrupted sleep is priceless for both parents and babies!