IMO If it can be used for food or put in the mouth (i.e. it's a bowl, platter, cup, spoon, baby rattle, toy, etc) it should have a food safe finish (or no interior finish). Should also be made from safe material (i.e. wood with low allergy/reaction issues).
Art or display pieces, hollow forms, etc can be from other materials and have other finishes.
Boxes might be in some middle-ground if you think someone might be storing spices, or their "stash", or whatever...