A main source for the ages
The development of stranger fear in infancy and toddlerhood: normative development, individual differences, antecedents, and outcomes
Rebecca J. Brooker, Kristin A. Buss, Kathryn Lemery‐Chalfant, Nazan S. Aksan, Richard J. Davidson, H. Hill Goldsmith · 2013 · Developmental Science
- Children
- About 1,300 twins
- Where
- Wisconsin, United States
- Ages
- 6 months to 3 years
- How
- Parents' questionnaires and researchers' observations as children grew
- What it found
- Wariness of strangers rose on average from 6 to 12 months and then levelled off. Children followed different paths: about 4 in 10 rose steeply, about a third rose slowly, and about 1 in 4 started high.
- Limits
- It describes how wariness changes, not the age it starts. Mostly white families in one state.