Background: This qualitative study aimed to explore how mothers gave meaning to their experiences of raising a child with autism spectrum disorder (ASD) in Malaysia. Methods: Using interpretative phenomenological analysis, semistructured interviews were conducted with 8 Malaysian mothers from different ethnic backgrounds (4 Chinese, 3 Malays, and 1 Indian). Results: Three themes for the mothers' adaptation and wellbeing development were identified, including Problem realisation within the context: Learning to spell A-U-T-I-S-M in Malaysia, WE are living with autism, and Resilient overcoming: Climbing Mount Kinabalu. The mothers viewed their child's ASD symptoms and behaviour problems (e.g., hyperactivity and sleep difficulties) as taking a toll on wellbeing. However, coping strategies, including acceptance, proactive mindset, character growth, spirituality, and parent support networks, fostered wellbeing. Conclusion: Both intrapersonal and interpersonal protective processes were important. The findings suggested that Seligman's (2011) PERMA framework may be applicable to understanding parental wellbeing. Clinical, policy, and research suggestions were discussed.