I believe the correct answer is secure babies.
The attachment in early years of development is truly
important and influential on later character development. Psychologists concluded
that there are four types of attachment that might be developed in early years
between parent and a baby: secure, avoidant, ambivalent and
disorganized-disoriented. Psychologist Mary Ainsworth devised the “Strange
Situation” experiment to assess the quality of an infant's attachment to the
care giver. This experiment showed that babies with secure attachment to their
care giver would cry when their mother left the room but were happy upon her
return.
