Nearly half of all U.S. presidents were firstborns; only four were lastborns.
Middle children can feel forgotten or overlooked because of the attention or demands of either the firstborns or the lastborns.
Middle children have also been found to succeed in team sports, and both they and lastborns have been found to be more socially adjusted if they come from large families.
Lastborns are generally considered to be the family "baby" throughout their lives.
Because of nurturing from many older family members and the example of their siblings, lastborns from large families tend to develop strong social and coping skills and may even be able to reach some milestones earlier.