What do bed bug nymphs look like?

"I’m finding these weird little bugs near my bed. Are they bed bug nymphs?"

It's possible. Bed bug nymphs — the juvenile stage of the bed bug life cycle — are one of the trickiest things to spot in an infestation. They're small, pale, and easy to overlook. Knowing what to look for can make a real difference in catching a problem early.

A bed bug nymph goes through five developmental stages, called instars, before reaching adulthood. At each stage, it needs a blood meal to grow and molt into the next. The whole process from egg to adult can take as little as five weeks under warm conditions, which helps explain why infestations can grow quickly. For a broader overview of these pests, our bed bug identification guide covers the key signs to look for.

What does a bed bug nymph look like?

Nymph bed bugs are miniature versions of adults, but with some key differences:

• Color: Newly hatched nymphs are almost translucent or pale yellow-white. After feeding, they turn a brighter red or deep brown as blood fills their bodies. Unfed nymphs are very hard to see against light-colored bedding.
• Size: First-instar nymphs are roughly 1/16 of an inch (about the size of a sesame seed). They grow with each molt, reaching close to adult size (around 3/16 of an inch) by the fifth instar.
• Shape: Like adults, nymph bed bugs have flat, oval bodies. They lack the darker, more defined coloring of a fully grown bed bug.

One thing that makes young bed bug nymphs particularly hard to detect is that unfed first instars are nearly colorless. They can be almost invisible to the naked eye unless you know exactly where to look. Ehrlich technicians know exactly where to look and which treatments might be needed to control an infestation. Find out more about our bed bug control services.