The head lice nymph is the intermediate stage in the lice life cycle. The shape mostly resembles an adult, with six legs coming off of a central body. The nymphs are much smaller than the adults.

Head lice have a three-stage life cycle. They begin as nits, hatch and become nymphs, and become full-sized adults within weeks. Read more about them here.

Head lice also seem to be fighting back against the chemicals we've been using against them and it's getting harder to clear children of infestations. ... to break the life cycle of the head lice.