When All Else Fails . . .
According to Dr. Karp, five to 10 percent of babies don't respond to white noise and swaddling; they still wake every two to three hours. In those cases, he says, "they need to sleep in a fully reclined swing moving at the fast speed."
Source: Flickr user jbird
Read More Baby Sleep ScheduleDr. Harvey KarpBig Kid SleepBaby SleepInterviewsParentingBaby