Bed bugs are small, flat, oval-shaped insects that are reddish-brown in color. They are about the size and shape of an apple seed, measuring between 4 to 7 mm in length. Bed bugs have six legs and two antennae. They are wingless, but adults have the vestiges of wings called wing pads. Bed bugs can look different depending on their feeding status. If an adult bed bug has not fed recently, it is approximately 3/16" long and oval in shape. However, once it takes a blood meal, the body blows up like a balloon, and the bed bug elongates so that it looks more like a torpedo than a disc. The color also will be a bright red if the bed bug has fed within the last couple of hours. Newly hatched nymphs are approximately the size of the head of a pin and are white or tan until they feed. Bed bug eggs are tiny, pearl-white in color, and the size of a pinhead. They are marked by an eye spot if more than five days old.