Final answer:
A newborn designated as extremely low birth weight weighs less than 2,500 grams.
Step-by-step explanation:
The nurse understands that a newborn designated as extremely low birth weight weighs less than 2,500 grams. Low birth weight is defined as a weight at birth of less than 2.5 kg (5.5 lb).
It is important to note that low birth weight can increase the risk of disease and mortality in infancy, as well as lead to slow growth and developmental delays throughout early childhood. Therefore, healthcare professionals closely monitor the weight of newborns to ensure their growth and development are on track.