Three simple rephrasings using the word fetus
Here are three age-appropriate ways to say the idea, keeping the word fetus in each sentence.
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Version 1: A tiny fetus grows in mommy's tummy for about nine months before it is ready to be born.
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Version 2: A fetus grows in the mommy’s tummy for about nine months, and then it’s ready to see the world.
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Version 3: In mommy’s tummy, a fetus grows for roughly nine months until it is ready to be born and meet everyone.
Note for caregivers: If you need to simplify further for a 7-year-old, you can switch to baby before birth in a later discussion, but here the focus is on using the word fetus in three clear sentences.