What are the developmental advantages and disadvantages of children whose parents have them when they are young (e.g. teens or early twenties) compared to when they are old (e.g. late thirties)? Why is it difficult to research this question?

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The Answer of What are the developmental advantages and disadvantages of children whose parents have them when they are young (e.g. teens or early twenties) compared to when they are old (e.g. late thirties)? Why is it difficult to research this question?

What Are the Developmental Advantages and Disadvantages of Children Whose