Low birth weight is defined as a weight of:

Low birth weight is defined as a birth weight of 2500 grams or less. This classification is critical in obstetric care because infants who are born with low birth weight are at a higher risk of developing health complications, both immediately after birth and later in life. The significance of the 2500-gram threshold is supported by research showing that babies below this weight are more susceptible to issues such as respiratory distress, feeding difficulties, and increased morbidity and mortality rates.

Additionally, categories within low birth weight include very low birth weight (less than 1500 grams) and extremely low birth weight (less than 1000 grams). Understanding these categories helps healthcare providers assess risks and implement appropriate interventions for care and monitoring of infants. Thus, defining low birth weight as 2500 grams or less aligns with established guidelines and underscores the importance of this weight range in the context of maternal and neonatal health care.