Infant attachment evolves over millions of years to promote intimacy and closeness with parents through signals and behaviors from birth. Secure attachment in the first years provides children with foundations for independence, relationships skills, and a sense of belonging. Researchers estimate 50% of children experience insecure attachments, which can impact them lifelong by wiring their brains to reject others and have poor self-worth. Loving interactions like touch, eye contact, play are essential for secure attachment and healthy development.