Extremely low birth weight refers to newborns who weigh less than 1,000 grams or 2 pounds.

Extremely low birth weight (ELBW) refers to a condition in which a baby is born weighing less than 1,000 grams (2.2 pounds) or with a gestational age of less than 28 weeks. ELBW babies are at increased risk for a range of health problems, including respiratory and neurological complications, and may require intensive medical care in order to survive.

In psychology, research on ELBW may focus on the long-term outcomes of this condition, including the impact on cognitive and physical development, as well as the psychological and social challenges that may be faced by ELBW children and their families.

Examples of issues that might be studied in psychology research on ELBW might include the effects of premature birth on brain development, the impact of medical interventions on long-term outcomes, or the psychological and social challenges faced by families of ELBW children. Psychologists may also work with ELBW children and their families to address any psychological or social issues that may arise as a result of this condition.