This study utilised a longitudinal population-based study to explore mother and child mental health trajectories over time from child age 0 to 14 years, between children with ASD, ADHD, or ASD + ADHD. It explored whether a bidirectional relationship between mother psychological distress and child emotional and behavioural problems (EBPs) existed. The birth cohort from the Longitudinal Study of Australian Children was used. Child EBPs were assessed using the Strengths and Difficulties Questionnaire; and mother emotional distress using the Kessler K6. Generalised estimating equations and structured equation modelling was used to understand changes over time, differences between groups and bidirectional relationships. As expected, children with ASD, ADHD or ASD + ADHD had higher EBPs than children without, and their mothers had higher levels of psychological distress across most time points, but with differing trajectories. Mothers of children with ASD (with or without ADHD) showed increasing psychological distress over time, while mothers of children with ADHD had reducing distress. The bidirectional relationship between mother and child mental health found in children without diagnoses was only partially present in children with ASD/ADHD. Findings highlight support needs and discuss implications for transactional models of parent/child emotional problems in children with neurodevelopmental disorders.

For children experiencing emotional and behavioural difficulties, parents are key gatekeepers to treatment access. However, despite the substantial prevalence of child mental health problems in Australia, there remains a significant disparity between the rate of children requiring treatment and the rate of parents actively seeking professional help for their child. Therefore, an understanding of factors impacting on parents’ help-seeking behaviour is crucial. The current study presents exploratory research examining the impact of parent beliefs on help-seeking behaviour. Specifically, this study aims to explore parent beliefs about (a) barriers to help-seeking (b) parenting ability, and (c) the causes and nature of child difficulties. Participants in this study were a sample of 399 Australian parents of children aged from 4 to 14 years, with each parent completing a series of four structured questionnaires. Results indicated that parents who had not sought help for their child perceived significantly more barriers to help seeking and held significantly stronger beliefs that child emotional and behavioural difficulties are intentional. Results also indicated that as parents’ sense of competence increased, perceived barriers to help seeking decreased. Perceived barriers to help seeking also decreased as parent beliefs that child difficulties are stable decreased. The present study presents several implications for informing effective engagement strategies to improve service utilisation, highlighting directions for future hypothesis-driven research.