I ask this because I am a mama with a two year old and never tried it with him he is a good-ish sleeper most the time but I'm expecting baby number 2 and I'm remembering the sleepless nights of having a newborn and I'm sure the newborn will wake up my son from time to time.  I'm willing to try new things this time around as I read a lot of parents swear by it however I have also read studies and reports suggesting it's not good as it can cause problems with hearing and so on.