I concur with bwa, a babysitter, under 18, does not need to file a tax return with less than $6200 of income. Yes, there's a possibility (not probability) of an IRS inquiry because the employer filed form 2441. But, that's easily explained. The age limit is also an exception to the employer having to file schedule H.
This assumes the baby sitting was done in the client's home. Baby sitting in the 14 year old's home makes it self employment.
