Storks have been associated with babies and family for centuries.
In Greek mythology, they were associated with stealing babies after Hera turned her rival into a stork, and the stork woman attempted to steal her son.
In Egyptian mythology, the soul of a person, The Ba, was usually represented by a stork. The return of a stork meant the return of the soul, at which point the person could become animated again.
In Norse mythology, the stork represented family values and commitment to one another.
According to British folklore, the stork is a symbol of fertility, a fact that chiefly manifests itself in god awful 1950s cartoons of expectant parents seriously misleading their existing children about the realities of human reproduction.