I know there is a serious side to Easter, but for the sake of this little piece, I'm going to go with this idea of the "fertility" version of things :)
It seems probable that around the second century A.D., Christian missionaries seeking to convert the tribes of northern Europe noticed that the Christian holiday commemorating the resurrection of Jesus roughly coincided with the Teutonic springtime celebrations, which emphasized the triumph of life over death. Christian Easter gradually absorbed the traditional symbols.
Hares and rabbits have long been symbols of fertility. The inclusion of the hare into Easter customs appears to have originated in Germany, where tales were told of an "Easter hare" who laid eggs for children to find.
Eggs have been viewed as symbols of new life and fertility through the ages. It is believed that for this reason many ancient cultures, including the Ancient Egyptians, Persians, and Romans, used eggs during their spring festivals.
Each Easter season, Americans buy more than 700 million Marshmallow Peeps, shaped like chicks, as well as Marshmallow Bunnies and Marshmallow Eggs, making them the most popular non-chocolate Easter candy.