Yes — small lymph nodes are often a normal finding. Lymph nodes are bean-shaped filters in the immune system, commonly felt in the neck, under the jaw, in the armpits, and in the groin. In children, MedlinePlus notes a node is generally considered enlarged if it is more than about 1 centimeter (0.4 inch) wide, which implies smaller nodes can fall in the expected range.
Nodes commonly swell temporarily when the body fights an infection such as a cold or other viral illness — Mayo Clinic says infection is the most common cause of swollen lymph nodes — and a node may take several weeks to return toward its usual size. Contact a clinician if a node keeps growing, stays enlarged for several weeks, feels hard or fixed, or comes with fever, night sweats, or unexplained weight loss.
Sources: Swollen lymph nodes — Mayo Clinic; Swollen lymph nodes — MedlinePlus.