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California BIRTH Defects Monitoring

What are Limb Deficiencies?

Upper and lower limb reduction defects occur when a part of or the entire arm (upper limb) or leg (lower limb) of a fetus fails to form completely during pregnancy. The defect is referred to as a "limb reduction" because a limb is reduced from its normal size or is missing.

Content provided by the Centers for Disease Control and Prevention (CDC). For information and references about Prevention, please visit: Facts about Upper and Lower Limb Reduction Defects.


 *Cases per 10,000 Live Births

 **White, Black, Asian/Pacific Islander categories are all non-Hispanic

 Data Source: California Birth Defects Monitoring Program Registry, 2012-2016 (PDF),

California Central Valley Counties (Fresno, Kern, Kings, Madera, Merced, San

Joaquin, Stanislaus, and Tulare).

 Back to Data Sheets

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