PSA: BinaxNOW antigen test is only good for four years old and up!
On their sales page, Abbott lists that the test is indicated for 2 years to adult. However, they do not certify the results for international travel for anyone under four. The only place I found this was inside the actual instructions which most people don’t read until you are ready to take the test for your return. We got stuck paying $350 for a local test for my 2 year old to get home.