Small children often overhear more of what is said than adults realize or desire.1844, Charlotte M. Yonge, Abbeychurch, ch. 2:Seeing me listening to something she was saying to Mamma, she turned round upon me with that odious proverb, "Little pitchers have long ears."1939, "Bedtime Bedlam," Time, 17 Apr.:A caution to U. S. parents, but a joy to radio merchandising, is the dread truth that little pitchers have big ears.2002, Stephen King, On Writing: A Memoir of the Craft, ISBN 9780743455961, p. 185:I suppose he might say pushed or went woowoo, but took a shit is, I fear, very much in the ballpark (little pitchers have big ears, after all).

Sometimes little children who listen to old people’s conversation hear and perceive things a lot than people expect them to