Factors which was concerned to low birth weigh: mothers live in countryside (p= 0.007, OR= 1.91), mothers which education is low (p= 0.025, OR= 2.06), mothers which their economy is difficult (p< 0.0001, OR= 6), mothers exammine pregnancy low 3 times (p< 0.0001, OR= 4.7), mothers are sick in time of pregnancy (p<0.0001, OR= 9.7), mothers which anxious and unhappy in time of pregnancy (p<0.0001, OR= 6).