Flea larvae aren’t dangerous or harmful to humans. The “baby fleas” live deep within carpet fibers, and feed on the feces from adult fleas. Cat flea larvae don’t live on animals, and don’t feed parasitically.
Flea Larvae are Rarely Seen
Fleas in the larval stage aren’t dangerous to humans or other animals. In fact, it’s rare to even see flea larvae, because they’re negatively phototactic and will rapidly move to areas where light can’t reach. In domestic infestations, a majority of the larvae will be found living at the base of carpets.
Flea Larvae aren’t Parasitic
Cat flea larvae are free-living (not parasitic). They neither live on, nor parasitically feed from, a host, including humans. Flea larvae lack the piercing and sucking mouth parts needed for parasitic feeding. Instead, they have mandibles for chewing solid foods. The larvae consume dried fecal blood dropped by adult fleas, as well as conspecific eggs.