This will not surprise anyone, but further research demonstrates that inhibited, shy children tend to become anxious adults. Part of this is likely inherited hypersensitivity of the nervous system–one notable example being the “shy, blue-eyed boy” syndrome linked with ADD.

While I wrote Bad Boyfriends with the emphasis on early caregiver effects on attachment type, there are clearly some genetic components and predispositions to attachment types.

More on Attachment and Personality Types:

What Attachment Type Are You?
Type: Secure
Type: Anxious-Preoccupied
Type: Dismissive-Avoidant
Type: Fearful-Avoidant (aka Anxious-Avoidant)
Avoidant: Emotions Repressed Beneath Conscious Level
Serial Monogamy: the Fearful-Avoidant Do It Faster
Anxious-Preoccupied: Stuck on the Dismissive?
Anxious-Preoccupied / Dismissive-Avoidant Couples: the Silent Treatment
nxious-Preoccupied: Clingy and Insecure Relationship Example
Domestic Violence: Ray and Janay Rice
Malignant Narcissists
Teaching Narcissists to Activate Empathy
Histrionic Personality: Seductive, Dramatic, Theatrical
Life Is Unfair! The Great Chain of Dysfunction Ends With You.
Love Songs of the Secure Attachment Type
On Addiction and the Urge to Rescue
Sale! Sale! Sale! – “Bad Boyfriends” for Kindle, $2.99
Controlling Your Inner Critic: Subpersonalities
“Big Bang Theory” — Aspergers and Emotional/Social Intelligence
Porn Addiction and NoFAP
Introverts in Management