Nascency
Part of speech: noun
Definition: A state of incipiency; a quality of nascence.
Nativity
Part of speech: noun
Definition: Birth; the place, time and circumstances of a birth.The birth of Jesus Christ (the Nativity).A horoscope associated with a person's birth.
Example sentence: My first role was an angel in the nursery nativity. I spotted my mum halfway through and shouted over someone else's lines to ask if she liked my costume. I've learnt not to do that now.