"Slow-to-warm-up" refers to a temperament style often seen in children who may be cautious or reserved in new situations. These individuals typically take their time to adjust to unfamiliar environments, people, or experiences. They may initially react with hesitation or shyness but gradually become more comfortable as they become familiar with their surroundings. This temperament is part of a broader classification of personality traits, which also includes easy temperament and difficult temperament. Understanding the slow-to-warm-up style can help caregivers and educators provide appropriate support, allowing these individuals to thrive at their own pace.