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People should not take too many mouthfuls at once and should chew thoroughly each of the mouthfuls one at a time.
It may be harmful to your guts if you don't do that.
My child don't often do that.
What is the idiomatic way to express it?
Do you say "please chew this mouthful thoroughly before taking another one"?
The most common way I've heard this expressed (in my American English experience) is "don't gulp your food."
gulp, transitive verb
1 : to swallow hurriedly or greedily or in one swallow
Merriam-Webster
In fact, one of the example sentences provided by Merriam-Webster has this exact usage:
She told him not to gulp his food.
