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[0] Nurses should know some basic definitions concerning preterm birth, preterm labor, and low birth weight. For instance: [1] The terms preterm birth and low birth weight can be used interchangeably. [2] >>Preterm labor is defined as cervical changes and uterine contractions occurring between 20 and 37 weeks of pregnancy. [3] Low birth weight is anything below 3.7 pounds. [4] 
In the United States early in this century, preterm birth accounted for 18% to 20% of all births.
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