Is any dosage of aspirin safe for children under the age of 5?
Aspirin is a nonsteroidal anti-inflammatory drug, or NSAID, and its uses vary between conditions. For example, children with juvenile rheumatoid arthritis take a larger dose than those suffering with a fever. As it is an NSAID, parents should consult with their doctor before administering other NSAIDs, including Ibuprofen.
Sources: webmd.com, drugs.com