Brief Report: Health-Related Quality of Life in Preschoolers with Autism Spectrum Disorder is Related to Diagnostic Age and Autistic Symptom Severity.

Shawler et al. (2021) asked Chilean parents of preschoolers with autism how healthy and happy their kids seemed.

They also wrote down each child’s age when first told "your child has ASD" and how severe the symptoms looked now.

No therapy was given; the team just looked at whether earlier diagnosis and higher severity went hand-in-hand with lower quality-of-life scores.

The earlier a child was diagnosed, and the more intense the autism traits, the lower the caregivers rated the child’s quality of life.

In plain words, very young toddlers flagged as autistic and those with lots of repetitive or social-difficulty behaviors were seen as enjoying life less.

Kuhlthau et al. (2010) and Lee et al. (2008) already showed kids with ASD score lower on quality-of-life measures than typical peers or kids with ADHD.

Mello et al. (2019) found the same link in U.S. preschool families: higher autism severity predicted poorer family quality of life.

Melegari et al. (2025) zoom in further, showing sleep problems in young autistic children are the top stressor dragging down caregiver quality of life.

Together the picture is clear: child severity hurts both child and family well-being, and the hurt starts early.

When you assess a toddler, note diagnosis age and current symptom level. If both are high, expect lower parent-reported quality of life and plan extra supports—sleep plans, respite, or parent training—right away instead of waiting for problem behaviors to snowball.