Cat purring in contentment (Photo credit: Monica / Flickr). Kittens begin purring right after they are born; they learn to make their characteristic vibrations within a week of birth. The sound is first produced while nursing to reassure the mother cat and help her bond with her newborn kitten. Here, low-decibel purrs communicate comfort, pleasure and security. Cats make use of a variety of meaningful vocalizations, from meows, wails and angry hisses to the soothing vibrations of the purr.