It would be more usual to say, in that context:
1. You should make a sandwich so that the child doesn't get hungry. ] i.e. to prevent hunger.
2. You should make a child to stop the child feeling hungry. ] i.e. to cure hunger.
Or, closer to your version:
3. You should make a child in order that the child doesn't feel hungry any more.
But you would not use "was/were not hungry".
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