After the main attachment is formed, the infant develops a wider circle of multiple attachments, depending on how many consistent relationships they have
Schaffer & Emerson found that, within one month of first becoming attached, 29% of infants had multiple attachments to someone ese (e.g.: grandparents, siblings, friends, etc.)
These are called secondary attachments, and infants also display separation anxiety in these relationships
Within six months, this had risen to 78% of infants
By the age of 1 year, the majority of infants had developed multiple attachments, with 1/3 of infants having formed 5 or more secondary attachments