1. the earliest period of childhood, especially the first year of life
2. the early stage of development of something
Usage: figurative

Examples

• The baby slept peacefully during her infancy.
• He showed signs of musical talent from infancy.
• During infancy, children develop rapidly.
• The internet was still in its infancy in the 1990s.
• The company is no longer in its infancy.
• Space exploration was in its infancy fifty years ago.