The following conversation with Lucy (4yo) all happened this morning, at entirely normal indoor volume.
Lucy: “Daddy come help, help, help.”
Me: “Ok. There you go.”
Lucy: “Thank you, you, you.”
Me: “Why are you repeating the last word three times?”
Lucy: “Because I am very loud, loud, loud.”
Me: “Ah, so you are making an echo, echo, echo.”
Lucy: “Yes, yes, yes.”