Final answer:
The most common injury in children under age 5 is scalds, which occur when a child's skin comes in contact with hot liquid or steam.
Step-by-step explanation:
The most common injury in children under age 5 is scalds. A scald occurs when a child's skin comes in contact with hot liquid or steam, resulting in a burn. Scalds can happen when a child spills hot liquids on themselves or if they come into contact with hot objects or surfaces.