Pictures of baby bed bugs can be viewed at the Environmental Protection Agency, University of Kentucky College of Agriculture, Food and Environment, and Pest World websites. These sources provide pictures of the life stages of bed bugs along with information on how to treat infestations.
A baby bed bug is called a nymph. Once it hatches, the nymph goes through five stages before reaching adulthood. At the first stage, it's 1.5 millimeters long, and during each stage it grows another 1/2 millimeter until it is 4.5 millimeters at stage five. Between each stage, the nymph molts or sheds its skin. By the time the bed bug reaches adulthood, it can be up to 1/4 inch long. Normally a whitish color, a bed bug turns brown once it feeds either as a nymph or an adult.
Bed bugs usually infest mattresses because their food source, humans, are nearby. The bugs crawl out of hiding during the night to bite and congregate during the day. Although people don't feel the bite of a bed bug during the actual feeding process, small, itchy welts appear at the bite location. Sometimes the welt doesn't develop for several days or weeks. Dealing with an infestation often requires a professional because bed bugs are so difficult to get rid of.