If the other 4 children thrive on normal food, would that be admissable evidence in the trial for the baby's death?
It doesn't sound like the other children were thriving and the nutritional needs of infants are different. I've read reports of children on strict vegetarian diets and they often can have "failure to thrive" where they stop growing and gaining weight. Anyone who does a diet like that really has to know what they are doing. Probably the only reason the other kids did better was because they were able to sneak real food. If you're hungry enough, you'll do it and risk the beating, I'm sure, cause you might not get caught.