What happens when a child is weaned before its time and dies as a result?
In the Dalmatin region of Croatia the dead child becomes a a Kozlak.
The Kozlak raises from the dead and acts like a poltergeist breaking and throwing kitchen items, shape-shifting unto a bat or carrion animal. It will attack live stock and feed from it.
While in a solid but nondescript form it can be hypnotized by a branch of Hawthorn. While in a trance it can be stabbed in the heart with a branch of Hawthorn or a ritually blessed daggar. Its best if a Franciscian monk does the killing.
Duppy originated in Jamaican lore. A vampiric spirit or benevolent spirit created by the shadow of the dead person. They’re feared because their breath can cause illness and if you’re touched, “Duppy boxing” can cause seizures.
In Caribbean lore, Duppies are called Jumbies.
You can conjure a Duppy by throwing Rum coins into a grave. They attack the living and cause poltergeist activities once raised.