Eggnog can be consumed during pregnancy but requires caution. Commercial eggnog is pasteurized and safe; homemade is not. The key guidance from FDA: Only drink commercially pasteurized eggnog; avoid homemade and alcoholic versions. Potential concerns include: Raw eggs in homemade versions, Alcohol in spiked versions. These risks are manageable when you follow the recommended limits.
A "Use Caution" rating means this food is generally fine during pregnancy but comes with a specific factor worth managing — a daily limit, a preparation requirement, or a moderation guideline — rather than a reason to avoid it outright. These ratings reflect general guidance from the FDA, ACOG, CDC, and USDA. The goal of the "caution" label is to flag what to pay attention to, not to suggest the food is unsafe when that factor is properly managed.