A bun in the oven
/ə bʌn ɪn ði ˈʌvən/informalUK · US
What does “A bun in the oven” mean?
A bun in the oven means a baby developing during pregnancy
This is a playful way to say someone is pregnant. You will usually hear it in casual conversation or a light-hearted announcement.
It can feel old-fashioned or too personal. Avoid using it to guess whether someone is pregnant or to comment on their body.
When do people say it?
Use “have a bun in the oven” only in a setting where a joking reference to pregnancy is welcome.
“At dinner, Jo announced that she had a bun in the oven.”
Is it formal or informal?
Register: informal. It is most at home in everyday conversation rather than formal writing. Most common in UK and US.
Where does it come from?
The phrase compares a baby developing during pregnancy to a bun baking in an oven.
Origin confidence: Disputed; treat with caution
How do you say “A bun in the oven” in other languages?
Last updated 2026-09-19