I certainly have never heard that. if the prey is too large, they either won't eat it, or if it's REALLY too big, they won't even strike it. I would think of a host of other causes before I'd think food. UNLESS the food you offered came into contact with a substance that might be toxic to a snake. Ivermectin for mites for example. Or something similar. Parasite treatments, internal or external, or anything of that nature that was on or inside the prey offered could easily affect a snake that consumed such prey.
However, since it only affected one baby, that only makes sense if that one prey item had a much higher concentration of a toxic substance than all the rest. Heat spikes cause severe neurological damage. I know this from personal experience. A toxin in the air is another possibility, but it seems to me an unlikely one. I suppose if you used a strong cleaner in the baby tubs, and that one tub had a lot of residue in it, that might have caused the problem.
Truthfully, it could have been any one of many things that caused it, or perhaps it is a birth defect that presented late. I know none of this makes you feel any better, I'm just kind of throwing out possibilities.
Gale
Reply With Quote