Which of these infant features or actions is LEAST prone to promote close bonds in the parent toward the child?

Question

Quizplus · Accepted Answer

A difficult temperament in an infant can make it challenging for parents to bond with their child. These infants may cry frequently, have trouble sleeping, and be generally irritable, which can be frustrating and exhausting for parents. In contrast, the other options (sucking and grasping reflexes, the Kewpie doll effect, and smiling) are all potential factors that could promote close bonds in parents toward their child.

Which of These Infant Features or Actions Is LEAST Prone