With a bun in the oven and With child

With child and with a bun in the oven are semantically related. In some cases you can use "With child" instead an adjective phrase "With a bun in the oven".

With child adjective - In an advanced stage of pregnancy.

With a bun in the oven and with child are semantically related. Sometimes you can use "With a bun in the oven" instead an adjective phrase "With child".