Development Stages of Bedbugs

Adult Bedbug

Adult Bedbug on a seam
  • Size: About 5 to 7 mm long
  • Color: Reddish-brown
  • Distinctive Feature: Oval and flattened body
  • Habitat: Cracks, beds, furniture
  • Detection Element: Small blood spots on bedding, sweetish odor, presence of small brownish bugs or their exuviae.

Adult bedbugs are the easiest to identify. They measure between 5 and 7 mm in length, with an oval and flattened body. Their color varies from brown to reddish, especially after feeding on blood. These insects are primarily nocturnal and hide in dark, isolated places during the day, such as wall cracks, mattress seams, and behind bed frames. Adults can live for several months, or even more than a year under optimal temperature conditions and with regular access to food (blood).

Bedbug Nymph

Bed Bug Nymph
  • Size: Smaller than adults
  • Color: Translucent after molting, then reddish
  • Distinctive Feature: Similar to adults but smaller
  • Habitat: Same as adults

Bedbug nymphs go through five developmental stages before reaching maturity. They start their lives barely larger than an egg and grow at each stage, from 1.5 mm to about 4.5 mm. Initially translucent, they gradually turn brown after consuming blood. The duration of each nymphal stage depends on environmental conditions, particularly temperature and food availability. Nymphs require a blood meal to progress to the next stage of their development.

Bedbug Eggs

Bedbug Eggs
  • Size: About 1 mm long
  • Color: Off-white
  • Distinctive Feature: Oval shape, often found in groups
  • Location: Near bedbug resting areas, such as mattresses, box springs, bed frames

Bedbug eggs are tiny, measuring about 1 mm in length. They are white and have an oval shape. Females lay eggs in discreet and protected locations, such as cracks, mattress seams, and other dark recesses. The eggs typically hatch in one to two weeks, depending on environmental conditions. A female’s ability to lay hundreds of eggs during her lifetime makes managing infestations particularly crucial.

Habitat of Bedbugs

Bedbugs prefer environments where they can feed on human blood, leading them to infest places like bedrooms, hotels, dormitories, and transportation such as buses or airplanes. They typically hide in places close to their food source, like beds, sofas, wall cracks, or bed frames. They can survive for long periods without feeding, making their eradication difficult. Bedbugs are not exclusive to poorly maintained dwellings; they can establish in any environment, provided they have access to a blood source.

Behavior of Bedbugs

These insects are primarily nocturnal and feed on human blood. Their main activity occurs at night when their hosts are asleep. The bite of a bedbug is often painless, and the victim only realizes it after the appearance of itching and red marks on the skin. Bedbugs are attracted to body heat and carbon dioxide emitted by humans during sleep. Although they do not transmit diseases, their bites can cause considerable discomfort and, in some people, an allergic reaction. They move from one place to another by clinging to clothing, luggage, and other personal belongings, facilitating their rapid spread from one location to another.

Distinguishing Bedbugs from Other Insects

Carpet Beetles

Carpet Beetles

Carpet beetles, unlike bedbugs, primarily feed on natural fibers like wool, silk, leather, or feathers. They are smaller, measuring about 2 to 4 millimeters long, and have an elongated body covered with hairs. Their color varies from brown to black, often with patterns or lighter spots on the back. They do not feed on blood and are typically found in places with carpets, woolen clothes, or upholstered furniture. Their presence is not usually associated with bites on human skin.



Fleas are external parasites that also feed on blood, but they can be distinguished from bedbugs by their ability to jump long distances, a characteristic bedbugs do not possess. Fleas are smaller, measuring about 1.5 to 3.3 millimeters long, and have a slender, elongated body, adapted for moving easily through the fur or feathers of their hosts. Fleas prefer pets like dogs and cats as hosts but can also bite humans. Flea bites are typically clustered and can be recognized by a small inflamed red area at the center.



Booklice, often mistaken for bedbugs, are tiny insects, generally measuring less than 1 millimeter in length. They are grayish or white in color and have an elongated, soft body. Unlike bedbugs, booklice primarily feed on molds, fungi, dead skin flakes, or paper residues. They are often found in humid environments and do not bite humans. Their presence is more an indicator of a humidity problem than a parasitic infestation.

Dust Mites

Dust Mites

Dust mites, particularly those associated with house dust, are microscopic organisms that are not visible to the naked eye. They measure about 0.2 to 0.3 millimeters long and feed on dead skin particles. Dust mites do not bite but can cause allergies and asthmatic reactions in some people. They are present in nearly all domestic habitats, especially in bedding, upholstered furniture, and carpets. Unlike bedbugs, dust mites are not parasites and do not require blood to survive.

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