concerns (theoretically) the middle children in a relationship, who have both an older and younger sibling. The syndrome implies that the middle child, in every case, will develop characteristics that neither young or older siblings will display.

MIDDLE-CHILD SYNDROME: "The middle-child syndrome implies that a middle child will not display nor have any of the characteristics of their elder or younger siblings."
Cite this page: N., Pam M.S., "MIDDLE-CHILD SYNDROME," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/middle-child-syndrome/ (accessed October 19, 2021).