They are stacking up.
1) mom left town but not without a Costco run. Given the large size of everything, dad proceeds to feed his children an entire half gallon of half and half in 2 days.
2) Bess wants a snack on the way to school in the stroller. Mom throws her the bag of the last two slices of bread. She reaches in and takes a few bites. Mom eventually noticed the (half eaten) bread was covered in mold.
3) baby guy is caught nibbling on something. Oh no! Get it out of his mouth! What is it? A dead worm.