What is the definition of low birth weight (LBW)?

Low birth weight (LBW) is defined as a birth weight of less than 2,500 grams (approximately 5 pounds, 8 ounces). This definition is widely accepted in the field of obstetrics and pediatrics and is crucial for assessing the health risks associated with newborns. Babies born with LBW are at higher risk for various complications, including respiratory issues, difficulty maintaining body temperature, and long-term developmental challenges.

The significance of the 2,500-gram threshold lies in the established correlation between lower birth weights and increased rates of infant mortality and morbidities. LBW can be attributed to a variety of factors, including premature birth, which is why being born before 37 weeks of gestation is another related concern but is not the defining parameter for low birth weight itself. Understanding this standard helps healthcare providers identify at-risk infants and ensure they receive appropriate care and monitoring.