On its website, Honda explains that the induced comfort may be because the low frequencies of the engine sounds are comparable to what babies hear in the womb.

Honda packaged the NSX engine sound into a red, car-shaped plush toy and recently let parents try it out an event. The company, however, doesn't have plans to produce the toy, but it has made the sounds of three engines -- the NSX, the Integra Type R and the S2000 -- available online.

Honda isn't the only car company to try its hand at calming children. Last year, Ford showed off a baby crib prototype that mimics the experience of a car ride. It plays muffled engine noises, has LEDs that simulate street lights and generates movements similar to those felt when riding in a car. Additionally, other companies, like Snoo, have mimicked womb sounds to comfort young children as well.