The main reasons of floating population low weight infant born are : 67.39% premature labor because of pregnancy housework,and 66.25% un-mature infants born attribute to innutrition,last only 19.1% among the pregnant women get the medical health care.

• 流动人口中低出生体重儿产生的原因主要是:妊娠后期的体力劳动引起早产占67.；39%25；孕期营养不良引起足月低出生体重儿(足月小于低龄儿)占66