Final answer:
The provided materials do not detail Cole and Leets' findings on attachment types from 1999 but do discuss Mary Ainsworth's and John Bowlby's foundational work on attachment theory, highlighting different styles and the impact of temperament and culture on attachment.
Step-by-step explanation:
What Cole and Leets found concerning attachment types in 1999 isn't provided in your given information. However, in the field of developmental psychology, significant work has been done to explore how infants connect with their caregivers. It's important to reference figures like Mary Ainsworth and John Bowlby in this context. Ainsworth, through the Strange Situation procedure, identified several attachment styles in infants, namely secure, avoidant, resistant, and later, disorganized attachment. Bowlby's theory posited that a healthy attachment involves a caregiver being responsive to the child's needs and engaging in mutually enjoyable interactions, forming a lifelong affectional bond.
However, criticisms have been noted such as the influence of a child's temperament and cultural variations affecting attachment styles. These complexities suggest that while Ainsworth's and Bowlby's works are foundational, ongoing research continues to refine our understanding of attachment.