Coping With Competition Between Twins
Twins can have sibling rivalry as much as siblings who are not twins, partly because of misconceptions about how twins act.
Approximately one-third of twin births are identical twins, developed from a single egg that splits into two after fertilization. Fraternal twins, which develop from two separate eggs, comprise the remaining two-thirds of twin births and are split evenly between same-sex twins and boy-girl sets.
Last reviewedOctober 2013by Michael Woods, MD
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