AUTHOR=Eow Shiang Yen , Gan Wan Ying , Jiang Tiemin , Loh Su Peng , Lee Ling Jun , Chin Yit Siew , Than Leslie Thian Lung , How Kang Nien , Thong Pui Ling , Liu Yanpin , Zhao Junying , Chen Lijun TITLE=MYBIOTA: A birth cohort on maternal and infant microbiota and its impact on infant health in Malaysia JOURNAL=Frontiers in Nutrition VOLUME=Volume 9 - 2022 YEAR=2022 URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2022.994607 DOI=10.3389/fnut.2022.994607 ISSN=2296-861X ABSTRACT=Background: The microbiota plays a key role in early immunity maturation that affects infant health and is associated with the development of non-communicable diseases and allergies in later life. Objective: The MYBIOTA is a prospective mother-infant cohort study in Malaysia aiming to determine the association between gut microbiota with infant health (temperament, gastrointestinal symptoms, eczema, asthma and developmental delays) in Selangor, Malaysia. Methods: Pregnant mothers will be enrolled in their first trimester of pregnancy, and a follow-up will be done for infants during their first year of life. Maternal-infant biological samples (blood, feces, saliva, urine, and breast milk), anthropometric, dietary, and clinical information will be collected at different time points from early pregnancy to 12 months postpartum. Discussion: This study could provide a better understanding of the colonization and development of the gut microbiome during early life and its impact on infant health. Trial registration: Clinical Trials ID: NCT04919265. First Submitted: June 9, 2021 (https://clinicaltrials.gov/).