Happiest Baby’s story began in 2002 with renowned pediatrician Dr. Harvey Karp. He developed the 5 S's method to help calm crying babies and promote better sleep — swaddling, shushing, swinging, sucking, and the side-stomach position. In 2016, Happiest Baby launched the SNOO Smart Sleeper as a way to provide responsive, safe, and supervised sleep to help babies sleep longer. The SNOO uses motion and white noise to mimic the calming sensations babies experience in the womb.