Stability of temperament in South Korean infants from 6 to 12 to 18 months: Moderation by age, gender, and birth order

- Examined stability of temperament across the first 18 months of life.
- Considered infant age, gender, and birth-order as moderators, in a Korean sample.
- Considerable stability of temperament attributes was observed overall.
- Some moderation by gender and birth-order, and no evidence of systematic age-related differences.