I don't blame the kid either, those things would be awfully tempting. The bags/containers also have repeated warnings on them to keep them out of the reach of kids (though that should be pretty obvious).
A seven month old doesn't have a massive range of mobility, the pods must have been somewhere within insanely easy reach. It's impossible to keep track of your kid at all times, it's not impossible to child-proof or move certain items. All of our cleaners and poisonous chemicals are in cabinets far higher than the kids could reach or up on high shelves in a closet they can't open.
Gotta do that as kids will get into everything, and everything goes in their mouth.