This study aimed to measure the proportion of adverse birth outcomes among all births and maternal factors associated with low birth weight among Indigenous (Orang Asli) infants in Kelantan, Malaysia. Proportionate stratified random sampling was done to select 327 samples from five antenatal centres involved with Orang Asli in Kelantan. Multiple logistic regression analysis was used to determine maternal factors associated with low birth weight among Orang Asli infants. The proportion of low birth weight was measured at 16.2% (substantially exceeding the national rate), preterm birth at 7.3%, stillbirth at 0.6%, early neonatal death at 0.6%, and macrosomia at 0.9%,. Maternal factors associated with low birth weight infants include primiparity (AdjOR: 2.88; 95% CI: 1.44,5.78), anaemia in pregnancy (AdjOR: 2.33; 95%CI: 1.18,4.61) and hypertension (AdjOR: 4.21; 95%CI: 1.23,14.44). In conclusion, far-reaching antenatal services and nutrition policy are essential to reduce the proportions of low birth weight among Orang Asli.