Definition: Percentage of infants born weighing less than 2,500 grams (approximately 5 lbs, 8 oz), by mother's age (e.g., in 2016, 6.3% of infants born to California women ages 25-29 were born at low birthweight).
Data Source: California Dept. of Public Health, Birth Statistical Master Files; CDC WONDER, Natality Public-Use Data (Feb. 2019).
Footnote: County-level data reflect the mother's county of residence, not the county in which the birth occurred. Data exclude infants for whom birthweight information is missing. The notation S refers to data that have been suppressed because there were fewer than 20 low-birthweight infants born to women in that group.