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Story summary
- A study in Israel finds infants with small or large head circumferences have threefold autism odds versus medium heads.
- For the 5% with the smallest or largest heads, odds rise to six to ten times.
- The study, published in Autism Research, included 262 autistic and 560 non-autistic children.
- It notes atypical head sizes often align with atypical heights and cautions that findings may not generalize beyond southern Israel.
