In seeing whatever info has been provided ...
It really does seem to be a roulette wheel, of chance, as to whether or not someone will get a thriving hatchling from Doc.
Doc states only "a couple of missed meals" (at least in one case where the hatchling died).
However, a healthy hatchling is not going to end up on the Grim Reaper's list over just a couple of skipped meals.
So, if the problem is, truly, a feed issue, it would seem that Doc is minimizing it and that there must be more missed meals than just a couple. Either that, or the feedings are way too spread apart.
OTOH If it is true, that there are only a couple of skipped meals (with proper feed system/days), ~that~ would raise my concern of its, possibly, being something else.
If Doc has a very poor documentation/feed system, &/or is actually making babies go without food (any at all or for very extended periods between meals), he need not minimize it. Otherwise, it brings into question what else it could be.
OTOH If he is being truthful, about "only a couple of skipped meals" (with proper feed system/days), he, himself, should be quite concerned and should be taking serious measures in determining exactly what it is (since it would not be due to feed issues).
In either scenario, Doc must take this matter seriously and must rectify it.
We can only hope he will because, thus far, it has not been shown that he is &/or will.