Final answer:
The irony in the first paragraph of 'The History of Tom Jones, a Foundling' creates contrast and foreshadowing for the story.
Step-by-step explanation:
The effect of the irony in the first paragraph of 'The History of Tom Jones, a Foundling' is to create a sense of contrast and foreshadowing. The ironic tone sets up the chaotic scene of Tom returning to collect his father's wealth, only to reject his pregnant fiancé. This irony hints at the unexpected and tumultuous events that will unfold in the story.