The dosh khaleen priestesses in the Dothraki holy city of Vaes Dothrak officiate a special ceremony when a khaleesi is expecting a child. The pregnant khaleesi must consume an entire raw stallion heart, accompanied by chanting from the dosh khaleen as they read the meaning of numerous omens. If the pregnant khaleesi is able to consume the entire stallion's heart, it means the Khal's unborn child will be strong. It is a negative omen if the pregnant khaleesi fails to consume the entire raw heart, or retches any of it up (made all the more difficult because a pregnant woman's stomach is more sensitive than under normal circumstances).