According to Bowlby's theory, how many strong attachments do infants need to develop normally?

Bowlby's attachment theory posits that the development of a strong primary attachment is crucial for infants to form secure relationships and to support their emotional and social development. According to Bowlby, having one strong attachment figure, typically the primary caregiver, provides a foundation for healthy emotional growth. This secure base is essential as it allows the child to explore their environment while knowing they have a safe place to return to.

Through this attachment, infants learn to regulate their emotions, understand social cues, and develop trust in others. Bowlby's research indicated that multiple attachments can later develop, but the initial development of a single strong attachment is foundational for the overall attachment system that will evolve as the child grows.