[BBLR didefinisikan sebagai bayi dengan berat lahir kurang dari 2500 gram.BBLR memiliki risiko lebih tinggi untuk mendapatkan masalah kesehatan danmeninggal pada masa neonatal. Kejadian BBLR mencapai 15 persen dari seluruhkelahiran bayi, dan lebih dari 95 persen terjadi di negara-negara berkembang.Secara keseluruhan, hampir 70 persen kejadian BBLR terjadi di Asia. MenurutRiskesdas 2010 dan 2013, BBLR di Jawa Timur mengalami peningkatan danmerupakan provinsi yang kejadian BBLRnya lebih tinggi dari angka nasional.Penelitian ini bertujuan untuk mengetahui faktor-faktor yang berhubungan dengankejadian BBLR di Jawa Timur tahun 2012. Metode penelitian yang digunakanadalah cross sectional dengan analisis data sekunder Survei Demografi KesehatanIndonesia 2012. Sampel penelitian adalah ibu umur 15-49 tahun yang dalam 5 tahunterakhir melahirkan bayi yang memiliki catatan berat lahir. Analisis statistik bivariatmenggunakan uji chi-square. Hasil penelitian menunjukkan 8,6% bayi lahir denganberat kurang dari 2500 gram (BBLR). Hasil analisis bivariat menunjukkan hubunganbermakna antara tingkat pendidikan ibu (OR: 2,34 CI 95%: 1,22 ? 4,48,) dengan nilaip sebesar 0,01, dan paritas ibu yang memiliki nilai p sebesar 0,04 (OR: 2,29 CI 95%:1,07 ? 4,91) dengan kejadian BBLR. Disarankan agar dilakukan penyuluhanmengenai hal-hal yang perlu diperhatikan saat hamil, seperti nutrisi dan pentingnyakunjungan ANC. Selain itu, diharapkan adanya anjuran menggunakan kontrasepsijangka panjang pada ibu yang telah melahirkan sedikitnya 4 kali.;LBW defined as babies who weight less than 2500 grams at birth. LBW babieshave a higher risk to face a health problems and higher risk to die at neonatalstage. For every babies born, 15 per cent of them were LBW, and the 95 per centof it can be found in developing countries. Overall, 70 per cent incidence of LBWwere found in Asia. According to 2010 and 2013 Basic Health Research, LBWincidence in East Java were increasing, and one of the province which have ahigher incidence from national incidence. The aim of this study is to know whatfactors associated with LBW incidence in East Java in 2012. This study use crosssectional as a method and use the data from DHS Indonesia 2012 for analysing.The sample of this study are women among 15 ? 49 of age who gave birth in aspan of 5 years before the survey and have birth weght data of the baby. Chisquaretest was used for bivariate analysis. Result of this study shows that 8,6 percent babies born with LBW. Bivariate analysis shows that level of educationofmothers (OR: 2,34 CI 95%: 1,22 ? 4,48,) with p value 0,01 and mothers parity with pvalue 0,04 (OR: 2,29 CI 95%: 1,07 ? 4,91) have a significant relationship with theincindence of LBW. Women with low level of education need to be counselled toknows the important things at pregnancy, such as nutrition intake and ANC visits. Formothers with high parity, it should be advised to use a long term contraception, LBW defined as babies who weight less than 2500 grams at birth. LBW babieshave a higher risk to face a health problems and higher risk to die at neonatalstage. For every babies born, 15 per cent of them were LBW, and the 95 per centof it can be found in developing countries. Overall, 70 per cent incidence of LBWwere found in Asia. According to 2010 and 2013 Basic Health Research, LBWincidence in East Java were increasing, and one of the province which have ahigher incidence from national incidence. The aim of this study is to know whatfactors associated with LBW incidence in East Java in 2012. This study use crosssectional as a method and use the data from DHS Indonesia 2012 for analysing.The sample of this study are women among 15 ? 49 of age who gave birth in aspan of 5 years before the survey and have birth weght data of the baby. Chisquaretest was used for bivariate analysis. Result of this study shows that 8,6 percent babies born with LBW. Bivariate analysis shows that level of educationofmothers (OR: 2,34 CI 95%: 1,22 ? 4,48,) with p value 0,01 and mothers parity with pvalue 0,04 (OR: 2,29 CI 95%: 1,07 ? 4,91) have a significant relationship with theincindence of LBW. Women with low level of education need to be counselled toknows the important things at pregnancy, such as nutrition intake and ANC visits. Formothers with high parity, it should be advised to use a long term contraception]