BTW, Quickleaf, this is an excellent thread topic- I hope you get a boatload of responses!
Thanks Danny
Great ideas so far, here are the ones I've come up with...
Apparition: A spirit appeared at the birth
Thrush Song: Thrushes flew above newborn, a sign of quick wit and flightiness
Selkie’s Kiss: A selkie kissed the newborn promising to keep them safe
Mysterious Hermit: A hermit from far away anointed the newborn’s head in oil and declared them a child of the gods
Sacrificial Bull: A bull was sacrificed in honor of the newborn – a sign of good health for the community
The Gray Fox: A shifty sign, a gray fox caused some mischief at the birth
Oak Hollow: Shortly after birth the newborn was bonded to an oak tree
Natural Disaster: Born during a fire, storm, or quake – a sign of a wild disposition
Twin-Tailed Comet: A sign of great heroes and tyrants
Blood Moon: Ominous sign of foul wizards, the dark feminine, and those who uncover secrets
Midsummer: Born on the avestial solstice, a sign of wakefulness and lurking evil. Your tree sign is the Oak.
Longest Night: Born on the hibernal solstice, a sign of rebirth and indulgence. Your tree sign is the Elder.
Wyvern’s Shadow: A wounded wyvern far from home flew over the place of birth.
In the campaign I'm preparing for birth omens are part of character creation, each providing a benefit and hindrance.