Just for information: there is no way a 5 day old gecko can be considered to be "off feed" since it's way too early for the gecko to start eating reliably.
If you decide to get another gecko, please don't get one that's younger than 4-6 weeks or much smaller than 15 grams.
Aliza
^^ This.
I had a hatchling who didn't start eating until over a week old, and didn't eat reliably until about two-three weeks old. This "breeder" seems to be trying to cover up the fact they sold you a very young, severely disabled gecko.