There are four main types of child abuse: physical, neglect, sexual, and emotional. Physical abuse involves harming a child's body, neglect is the failure to meet a child's basic needs, sexual abuse includes inappropriate sexual acts, and emotional abuse damages a child psychologically. Abuse often occurs at home with an abuser, abused child, and crisis triggering the abusive behavior. The abuser is usually a parent or caretaker experiencing stress, while children under two and those with disabilities are most vulnerable.