What size body pillow should I get?

For a standard adult side sleeper, a 20x54-inch straight body pillow is the most common size and fits a queen or king bed comfortably. 60-inch U-shaped pregnancy pillows take up a substantial portion of the bed and reviewers in shared beds frequently flag this as a downside. If you're between sizes, multiple reviewers across the threads we read suggested going smaller rather than larger, especially if you change positions during the night.