The review of international studies of attachment, Baby Bonds, found that infants aged below three who do not form strong bonds with their mother or father are more likely to suffer from aggression, defiance and hyperactivity when they get older. Attachment refers to the impact that children’s early parental care has on their social and emotional development. When a parent responds to a child in a warm, sensitive and responsive way — such as picking up the child when they cry and holding and reassuring them — the child feels secure and confident their needs will be met.
Study: 40 Percent Of Children Lacking Secure Attachments | BellyBelly
Good Parenting at Every Stage 