ADHD and Growth Faltering in Children: A Guide for Clinicians and Caregivers
The Scale of the Issue
ADHD is the most common neurodevelopmental diagnosis among children in Western Australia, affecting 7% of children aged 4–17.
The Core Concern: Growth Faltering
Children with ADHD face a significant risk of growth faltering, defined as inadequate physical growth for age and sex based on serial measurements. This risk stems from multiple factors, including:
- Dose-dependent appetite suppression caused by stimulant medications (methylphenidate, dexamphetamine, lisdexamfetamine).
- Executive dysfunction affecting regular eating habits.
- Sensory sensitivities that limit food choices.
- Co-occurring conditions that further complicate nutritional intake.
Medication Effects on Growth
Stimulant medications are known to cause dose-dependent appetite suppression, which can directly impact growth.
Non-stimulant options (atomoxetine, guanfacine, clonidine) have milder or weight-neutral effects, making them a potential alternative for children struggling with growth.
Identifying High-Risk Groups
Certain children require more vigilant monitoring:
- Children with a low BMI.
- History of preterm birth or chronic illness.
- Presence of eating disorders or psychosocial complexities.
Monitoring Recommendations
Regular growth monitoring (weight, height, BMI) is recommended at least every six months for all children with ADHD.
Management Approach
Interventions should be multi-faceted, including:
- Medication dose reduction or switching to a non-stimulant.
- Nutritional support and dietary strategies.
- Addressing underlying causes of poor intake.
Signs of Recovery
Catch-up growth is common after intervention. Reassuring indicators include:
- A BMI above the 10th percentile.
- Normal weight gain confirmed on two evaluations at least one month apart.
Cautionary Note
Relapse risk increases if the underlying aetiology is not addressed.
When organic causes are suspected, clinicians should consider blood tests to rule out other contributing factors.
Broader Context
ADHD symptoms impact not only growth but also cognitive development, social functioning, academic achievement, and daily living skills. Co-occurring conditions like autism spectrum disorder or avoidant restrictive food intake disorder can further exacerbate intake problems.
This article is authored by Dr Rona Kelly and Dr Sapna Jessy from the Child Development Service.