Conflicting information- Here is the email I received regarding children under 5:

Thank you for contacting St. Maarten EHAS.
My name is Jacquelyn Walker I am one of the EHAS administrative assistant with the island of St Maarten.
Pursuant to your question below children under the age of 5 don’t require a test. Hoping that I have informed you adequately.
Regards,

St, Maarten Tourism Bureau,

Jacquelyn Walker,