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Undernutrition and insufficient gestational weight gain can negatively affect maternal and infant health short- and long-term. In Vietnam, 50% of pregnant women lack essential nutrients, and 75% do not gain enough weight. Current interventions have limited success due to a gap in understanding their determinants. This study aimed to identify barriers and facilitators to healthy eating and weight gain among pregnant Vietnamese women. This qualitative study collected data from 20 pregnant Vietnamese women via virtual focus groups. Discussions were audio-recorded and translated into English for thematic analysis. The study utilized the Capability, Opportunity, Motivation to Behaviour (COM-B) model and Theoretical Domains Framework (TDF) to map the identified themes. Fifteen themes mapped onto nine of the 14 theoretical TDF domains, providing a comprehensive understanding of barriers and enablers to healthy eating and gestational weight gain within the COM-B model., Capability: Women had limited knowledge about food sources and the implications of insufficient weight gain and micronutrient deficiencies, though they exhibited high self-care and digital literacy., Opportunity: They lacked reliable online sources, had limited healthcare provider communication, spousal support, and faced cultural food beliefs and taboos., Motivation: The women understood the need for healthier lifestyles during pregnancy, but often lacked confidence in managing gestational weight and misunderstood the role of prenatal supplements. Our research identified key factors to inform future interventions to promote healthy eating and recommended weight gain during pregnancy among Vietnamese women. To be effective, interventions should focus on increasing nutritional knowledge, enhancing communiation with healthcare professionals, and improving husband supports. Addressing food taboos with culturally sensitive approaches is crucial. The potential of digits' al health interventions is enhanced by factors such as self-care and digital literacy among pregnant Vietnamese women., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)