dr. harvey kerp has a new book "the happiest baby guide to great sleep." welcome to the show, dr. karp. >> good to meet you. >> you, too. you're known for coaching babies to sleep with what you say, the five essence, that's your method, swaddling, placing the baby on the side or stomach but not while they're sleeping, swinging, sucking, and using shushing sound. i'm most intrigued by the sound componeabout, the white noise, i think you describe it. why is that so important? >> inside the womb, the sound babies hear is louder than a vacuum cleaner 24/7 and those sounds and all of the ss turn on a calming reflex that's like a relative off switch for crying and an on switch for sleep that all babies are born with. >> not all white noise is the same. i actually have a prop here. i want to show people, this is a little bit what it looks like here. and you can hear that plenty loud. a different setting on here that serves, but you also have rain, don't know if you can hear that, brook, there's even one that sort of simulates the sound in the womb. a heart beat. is thas what you're talki

dr. harvey kerp is a pediatrician with 30 years experience.atest book is "the happiest baby guide to great sleep." it goes on sale this tuesday and joins me from los angeles. welcome to the show, dr. kerp. >> thank you, dr. gupta. nice to meet you. >> you, too. you're known for coaching babies to sleep with the five ss. that's your method, which includes swaddling, placing the baby on its side or stomach, but not while sleeping, swinging, sucking and also using shushing sounds. i'm most intrigued by the sound component of this, the white noise as you describe it. why is that so important, dr. kerp? >> well, inside the womb, the sound babies hear is louder than a vacuum cleaner 24/7, and that sound and all of those ss that you talked about actually turn on a calming reflex that's like a relative off switch for crying and on switch for sleep that all babies are born with. >> you know, not all white noise is the same, and i actually have a prop here i want to show people. this is a little bit what it looks like here. you can hear that probably pl