The primary prerequisite to successful neonate feeding (and adults, for that matter) is environment. If your thermometer is INSIDE the warm-side hide or near it, and it accurately reflects 88F in that hide, I'm guessing your snake is spending little or no time in that hide. If this is the case, the cage temps are not conducive to appetite and digestion. If it's not in the warm hide, it's likely too cool to want to eat. It knows if it can't digest, there's no sense in eating. Before trying any other types of food, stabilize temps. It should be 80F-84F INSIDE the warm-side hide and below 80F INSIDE the cool-side hide. The hides must be dark inside.
So, here's what PROBABLY happened this week.
1. The snake may want to eat f/t pinks, but knows it shouldn't, so it's prudently fasting.
2. Tomorrow, if you do successfully get it to eat and temps are NOT correct, it will likely puke, and could spiral out of correction - from post-regurgitation complications.
3. Tomorrow, you could get it to eat a lizard, and perhaps it will puke it up and/or get hooked on a menu item that's pretty expensive to feed and some seasons, hard to get.
So, here's what CAN happen if you stabilize temps.
1. The snake will have an appetite and eat what you want it to.
2. Wait, there isn't a number two. What else could we ask?
Before trying anything other than a frozen/thawed pinky, first scrutinize the cage environment. Only if the cage temps are correct (and it's not feeding), should you consider trying alternate food items that won't be convenient for you. Also, it's rare, but lizards could transfer pollutants and parasites to your snake. No sense doing that unless it's absolutely necessary. You won't know if you're at that stage until you first offer it what it seeks; a proper cage atmosphere.
Bonne appetite,
Don
www.cornsnake.NET
South Mountain Reptiles