Some factors related to LBW found such as poor family (PR * = 8.45; 95% CI = 3.09 - 23.03), weight gain during term ≤ 9 kg (PR * = 3.18; 95% CI = 1.13 - 8.89), times of routine exam during term ≤ 3 times (PR * = 4.29; 95% CI = 1.34 - 13.76), mothers had medical problems during their term (PR * = 5.12; 95% CI = 1.32 - 19.88).