Try to feed it a 1 day old pinky mouse. Try to feed it a frozen/thawed one first. If it doesn't take it, try to feed just the head of a pinky, or a live pinky. Do you know when it hatched? If it hasn't had it's first shed yet, it may not eat until it sheds.
Rule of thumb is to feed prey that is the same width as the snake is.
Good luck!
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1.0 '01 Hypo snow cornsnake (Tesla)
0.1 '02 Ghost (pastel) cornsnake (Banshee)
1.1 '02 Bloodred cornsnakes (Desi and Luci Too)
1.0 WC Northern water snake (temporary pet - treating it for a cut on it's neck)
0.0.3 Goldfish (Kabuki, Isamu, and Yuki)
1.0 American Eskimo mutt (Rusty)