Looking up...
The birth of her child was the happiest moment of her life.
The moment when her child was born was the happiest moment of her life.
the act or process of being born
The birth of a baby is a joyous occasion.
When a baby is born, it is a happy event.
Can refer to the physical act of giving birth or the event of being born.
the origin or beginning of something
The birth of democracy in ancient Greece was a significant milestone.
The beginning of democracy in ancient Greece was an important event.
Used metaphorically to describe the start or creation of something.
Remember that 'birth' can refer to both the physical act of being born and the beginning of something abstract.
Use 'birth' for the act of being born or the beginning of something, not for the process of aging or growing.
Old English 'byrð', from Proto-Germanic 'burþiz', related to 'bear' (to carry).
Can be used literally (physical birth) or figuratively (beginning of something).