Bobbikins(1959)

This adventure follows the story of a young navy man, his wife and their baby son, Bobby, also known as Bobbikins. To his surprise, Dad discovers his son talks, not baby-talk or gibberish but has adult conversations with his father only. Bobbikins learns stock market tips and passes them to his Dad. After making a killing on the stock market, problems really begin. The dad is presumed mad, the government is after him, and the breakdown of relations between the young couple ensues. But there is hope.