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1) a little ***'s tummy cried for grain.
2) a famished cockerel
3) There was a little cockerel who felt his tummy growling for food
4) A cockerel felt his tummy was starving.
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It depends. Is this a children's tale or one for adults?
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not for adult
Then I like (3) best.

Personally, however, I am always repelled by the word 'tummy', and prefer 'stomache' even for diminutive use.
It is understood that a traveler hates tummy.
Students: Are you brave enough to let our tutors analyse your pronunciation?
I just have to be careful not to drink the water, Jobb.