Attachment is the very important bond between an infant and their primary caregiver(s). Anything that significantly and/or chronically disrupts or harms this relationship is considered an attachment trauma.
Sometimes this is due to circumstances outside the parent’s control, such as separation due to illness and hospitalization or incarceration.
Sometimes this is due to a significant misalignment between the infant’s needs and temperament and the care-giver’s abilities to attend to or meet those needs.
And of course, sometimes this is due to outright physical or sexual abuse.
This type of trauma is so serious as that primary attachment relationship is the model the individual will have of what relationships look like, it is where the child learns or does not learn how to self-sooth and if they learn to be attentive to their own needs.
The effects of such trauma are significant and long lasting. Some of the issues that arise due to this type of trauma include but are not limited to Reactive Attachment Disorder, PTSD, Complex PTSD, Borderline Personality Disorder, and Dissociative Identity Disorder.