Parental identification of early behavioural abnormalities in children with autistic disorder.

Katz et al. (2003) asked parents to look back and list the first unusual behaviors they saw in their child. The team grouped the answers into four buckets: moving, talking, playing with others, and odd fixations.

Parents also told how old the child was when they first worried and how long it took to get an autism diagnosis.

Mothers and fathers could clearly recall early red flags years later. Most families saw problems long before a doctor said "autism."

The gap between first worry and final diagnosis was often months or even years.

Older parent-survey studies match the new data. Joyce et al. (1988) already showed most parents spot signs before the second birthday. Rutter et al. (1987) found the same timing in Japanese families, proving the pattern crosses cultures.

Later work adds new layers. Barbaro et al. (2012) watched babies grow and confirmed that receptive language lags show up on tests as early as parents said. Redquest et al. (2021) tracked fine-motor delays and linked them to later autism scores, giving the motor domain real predictive teeth.

Warnes et al. (2005) seems to clash at first: they report that parent-remembered onset style does NOT predict later IQ or severity. The difference is focus. L et al. describe what parents see; Emily et al. ask if those stories forecast long-term outcome. Parents are reliable historians, but their timeline does not tell us how severe the child will be at age four.

You can trust parent interview data when you write an assessment report. If mom says "he never answered his name at 12 months," treat it as a valid clue. Use the four domains as a quick checklist during intake: ask about movement quirks, words lost, shared play, and repetitive interests. When red flags show up, start screening tools right away instead of waiting for the "let's see" visit. Early action shortens the painful wait families in this study endured.