When a middle child - typically of a family of three kids who are close in age - feels left out or neglected.Because the bigger sibling is the first born and typically an over-achiever, they are the most important and get the most privileges. A younger sibling is the 'baby' of a family and gets away with more as well as being the most looked-after. Middle-child syndrome starts when the middle child is squeezed between these two and have trouble finding their 'niche' in the family.Middle children will sometimes... -misbehave to get attention -go with the flow -work as little as possible -be less parent-dependent then their siblings -become the 'loner' of the family, not participate in family events unless told to. -play the peacemaker -be more likely to go to a friend for advice than a parent -be very creativeIn short its where the older child gets all the awards, the younger gets all the love, and the middle gets nothing.
Middle child syndrome definition by Urban Dictionary