Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of ELBW
Medically reviewed by Min Clinic Staff | Updated: January 2026
ELBW: Stands for extremely low birth weight. An ELBW baby is one born very prematurely weighing between 401 and 1000 grams (about 14 to 35 ounces) at birth. Extremely low birth weight babies are at the lower limits of viability.
If ELBW babies survive, they are at elevated risk for neurological abnormalities, hearing and visual impairment, and developmental delay in infancy. The lower a baby's weight at birth, the more likely the child is to be subject to such problems.