The Sanguin Chalis Inn

Be born with teeth or a caul: Sometimes it specifically has to be a red caul. In this case, it may be possible to avoid the change by burning the caul and feeding the ashes to the baby.

Animals Jumping over the body: If a person has died, and an animal (normally a cat) jumps over the body, before it has been properly buried, the person can become a vampire. In Romania this could be cured, by putting a piece of iron into the corpse's hand, or by placing some Hawthorn in the coffin.

Red Hair: In Greek Mythology it was very common that redhaired persons, after death would turn into vampires. This goes back the belief that Judas Iscariot had red hair.

Other Common Ways:

Suicide.

The seventh son.

Being bitten.

Drinking the blood of a vampire.

Being a victim of an unavenged murder.

A dead body that has been reflected in a mirror.

Not receiving a proper burial.