Notice the kind of interruption
The child may be asking about a word, predicting the next event, connecting the story to their day, or requesting a different book. Those are different signals. Try answering one concrete question and asking whether they want more pauses or a smoother reading of the next section. Avoid interpreting every comment as failure to listen. At the same time, it is reasonable for the reader to explain that constant restarts make it difficult to follow the story too.
Choose a rhythm together
You might pause at the end of each page, keep one finger marking a question, or save longer conversations until a short section ends. Keep the method simple and flexible. If the child needs an explanation to understand what is happening, provide it rather than insisting that all questions wait. If they are telling an unrelated story, acknowledge it and choose a time to hear it. Do not use the arrangement to silence a request to stop or a concern about the content.
Adjust the book or session if needed
A dense passage, unfamiliar setting, or overly long session may be creating more questions than the current moment can hold. Try a shorter section or another format. Ask afterward whether the rhythm helped. If the child mainly wants to talk with you, a conversation without a book may be the better activity tonight. A read-aloud does not have to reach a predetermined page count to be worthwhile, and the family can return to the story when the shared pace fits better.