Researchers at Frontiers in Child and Adolescent Psychiatry examined 46 children and teenagers in Singapore and surrounding regions who weren't diagnosed with autism until after age six. The study explored why these children—often bright, socially competent, and doing well at school—went unrecognized for so long, despite having autism.
The question was straightforward: what made these children invisible to parents, teachers, and even doctors, when autism is usually thought of as obvious and noticeable?
Girls with autism hide their traits far more than boys
The study found a striking gender difference. Girls with autism are much more likely to mask or camouflage their autistic traits—consciously or unconsciously copying how peers behave, suppressing their real interests, and forcing themselves to make eye contact and small talk, even when exhausted. This masking made their autism nearly invisible to adults around them.
Intelligence and calm temperament actually conceal autism
Paradoxically, the children's greatest strengths worked against diagnosis. Academically gifted children could figure out social 'rules' through logic. Children with naturally calm dispositions had fewer behavioral meltdowns—the kind that typically alert adults to something being different. In Singapore's academic-focused environment, a quiet, high-achieving student fits the ideal profile, making autism easy to overlook even when present.
Autism masked by other diagnoses like ADHD
Many late-diagnosed children had other conditions alongside autism, most commonly ADHD. When clinicians and parents focused on managing hyperactivity, inattention, or impulsivity, the underlying autism remained undiagnosed. This meant children received incomplete support for their actual needs.
Singapore's pressures make masking worse—and diagnosis harder
Singapore's competitive education system rewards the exact behaviors that help autistic children camouflage: sitting still, following rules precisely, achieving academically. A child excelling at math but struggling socially, becoming anxious at unstructured events, or needing extreme routine and predictability may show clear signs of autism—yet never be flagged for assessment because grades are strong.
The research reveals an important gap: success and autism coexist. A child's good behavior and academic performance don't rule out autism; they may simply mean the child is working very hard to mask.
What to look for beyond report cards
- Notice social patterns: few friendships, anxiety in unstructured settings, or difficulty with social give-and-take, regardless of academic achievement.
- Watch for intense, narrow interests and extreme need for routine or predictability alongside academic strength.
- Consider autism even if your child excels—particularly if they seem to exhaust themselves socially or struggle in non-academic environments.