Past research has shown a discrepancy in young infants' use of height information in occlusion and containment events--a pattern typically accounted for by event categorization and rule learning. Broadening these theories, the present experiment examined the role of comparison in young infants' reasoning about physical events. We rotated a typical setup of a top-open container 90 degrees such that the opening now faced the side. An object was held vertically aligned with the side opening, enhancing the direct comparison of height. After the object was glided behind or inside the container and became hidden, 5-month-olds detected a height change in both containment and occlusion events. Thus, enhanced support for comparison facilitated young infants' use of key information in physical events (i.e., height in containment events). The finding underscores the importance of considering the role of comparison in the research of intuitive physics in infancy.