Grossman & Grossman (1991)
Findings: Most infants were insecurely attached
(anxious avoidant) rather than securely attached. If the mothers were sensitive to their child’s needs, the child was more likely to have a secure attachment.
Over 10 years, 80% of children kept the same attachment type. Secure children enjoyed close friendships later in childhood, anxious avoidant children reported having no or few friends.