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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
For example, they have the child repeat, âmore,â then âmilk.â This is okay one time, or perhaps two, but please resist the urge to split up phrases every time you practice! This defeats your purpose! Model the phrase with the words together. You already know he can say single words.