I love the idea of being able to reassure the new born though of course, nothing beats the contact and the love of a mother ... for the moment the baby is not born yet but will be soon to in a few days ... so that I alone have tested: the sound is very good, adjustable, good surprise, especially at this price point, the batteries are already in it, Teddy is bigger than what I thought and also more cushioned and snug ;-), you can put the box in his belly or hand if you prefer, you can hang all these elements with Velcro on the bars or strollers, cradles etc .. .it will cover with which a mother must sleep to deposit its odor before giving it to the baby. The noise intrauterine resembles that when we listen we hear the baby heart when passing an ultrasound in slower ... It obviously I like this idea and I hope you like my son too, especially.