Definition of «bun in the oven»

"Bun in the oven" is an informal colloquial idiom used to indicate that a woman is pregnant. The expression metaphorically compares the female womb to a warm oven and the developing fetus to a loaf of bread gradually baking inside. It is typically employed in warm, joyful, or lighthearted social contexts when announcing an upcoming birth to family and friends. Because of its lighthearted and familiar tone, the phrase is rarely used in official medical settings or formal writing.