Ancient Customs, Modern Fertility Treatments
Why did eggs become fertility symbols? Eggs figure in many traditions, both Christian and many others which are more ancient. Probably the origin was in observing birds building nests and laying eggs in the spring. Eggs became associated with spring, which symbolized new life, fertility and growth.
In ancient Egypt, Greece, Rome and Persia eggs were dyed as part of spring festivals. The Romans believed “All life begins with an egg,” and started major feasts with a first course of eggs. The early Christians considered eggs to be “the seed of life,” perhaps derived from the Roman tradition.
So eggs came to symbolize fertility to humans long before it was known that women and other mammals produce eggs, too, and that their eggs are fundamental to having an offspring.