Autism is diagnosed 3 to 4 times more often in boys than in girls. According to the CDC, in 2022, autism was identified in 49.2 per 1,000 boys vs. 14.3 per 1,000 girls—a 3.4:1 ratio.
That means roughly 1 in 20 boys and 1 in 70 girls receive an autism diagnosis.
Why the gap? Two fresh perspectives
- Underdiagnosis & “masking” in girls
Girls often learn social cues early on and quietly adapt—hiding routines or stimming in ways that seem typical. Experts now say many autistic girls fly under the radar because they don’t fit the classic “male” autism profile. The result? Estimates suggest nearly 80% of autistic females remain undiagnosed by age 18. - Biological resilience & diagnostic bias
The female protective effect theory argues girls need more genetic or environmental “hits” to show autism traits. Plus, most diagnostic tools were built around male behavior—so atypical presentations in girls are sometimes overlooked.
What matters? Spotting the signs early
Girls may show softer warning signs—like internalizing anxiety, sensory sensitivities, or socially acceptable stims (e.g., twisting hair). These may not trigger standard checklists for autism, delaying support. Awareness of diverse presentations is key.
Bottom line
Yes, autism still shows up more often in boys—but new research indicates girls are under-identified, not less likely to be autistic. Bridging that gap means updating assessments and valuing all ways autism shows up.
Looking for help? Able Stars offers autism services in Maryland, featuring school-based and home-based ABA therapy. If you’re seeking compassionate, tailored support, our programs can make a real difference. Contact us today!