Original Research Indonesian Midwifery and Health Sciences Journal Volume 7.No. 1, January 2023 Received: 15 November 2022 Revised: 30 November 2022 Accepted: 15 December 2022 Published: 28 January 2023 Available online at: http://e-journal.unair.ac.id/index.php/IMHSJ e-ISSN 2656-7806 ©Authors.2023 Published by Universitas Airlangga .This is an Open Access (OA) article distributed under the terms of the Creative Commons Attribution Share- Alike 4.0 International License (https://creativecommons.org/licenses/by- sa/4.0/). DOI: 10.20473/imhsj.v7i1.2023.19-25 RELATIONSHIP OF WEIGHT GAIN, ANEMIA AND AGE WITH LOW BIRTH WEIGHT INFANTS Irda Triyas Shant 1 , Rize Budi Amalia 1 , Martono Tri Utomo 2 1 School of Midwifery, Faculty of Medicine, Universitas Airlangga Surabaya 2 Department of Child Health, Faculty of Medicine, Universitas Airlangga Surabaya Alamat korespondensi: Jalan Raya Citra, Rukti Harjo, Lampung Tengah, 34155 Indonesia Email : irdatriyasshanty@gmail.com Abstract Background: The incidence of LBW is still an important health problem because it contributes to infant mortality. There are several factors that influence the occurrence of LBW there are weight gain, anemia and mother’s age during pregnancy. The incidence of LBW in east java province in 2018 was 6,4%, this figure was 0,2% higher than the national rate. The purpose of this study to determine the relationship between maternal weight gain during pregnancy, anemia and mother’s age with low birth weight babies at RSUD Dr. M. Soewandhie Surabaya. Method: This study used an observational analytic method with a case control approach. Sampling with consecutive sampling technique. Sampling used medical record data for mothers giving birth in the delivery room of RSUD Dr. M. Soewandhie Surabaya in 2018. The sample of this study were 45 mothers giving birth to babies with low birth weight (LBW)and 45 mothers giving birth to babies with normal birth weight (BBLN). Data analysis used the chi-square test. Result: The results of the chi-square test analysis with α 0,05 showed that anemia in the mother (p = 0.02) related with low birth weight. Meanwhile maternal weight gain during pregnancy (p = 0.06) and the mother’s age (p = 1) were not related to LBW. Conclusion: These research showed that there is corelation beetween anemia and Low Birth Weight and there is no related beetween maternal weight gain and mother’s age on Low Birth Weight. Keywords: LBW, maternal weight gain, anemia, mother’s age INTRODUCTION Low birth weight babies are still one of the highest causes of infant mortality, WHO estimates that ≥20 million low birth weight babies are born each year. The incidence of LBW in developing countries is 4 times greater than the rate of LBW in developed countries. In Indonesia, according to Riskesdas (2018), the incidence of LBW reached 6.2% and in East Java Province reached 6.4%. The secondary data obtained from Dr M. Soewandhie Surabaya Hospital in 2018 was 15.38%. The World Health Organization (WHO) defines LBW as a baby born with a low birth weight of less than 2,500 grams. LBW can cause various health problems, both short-term health problems and long-term health problems. Short-term problems that occur in LBW include metabolic disorders, immunity disorders,