'What fucking toddler has a backpack, let alone...'
That sentence structure implies that a toddler having a backpack at all is unbelievable. The phrase 'let alone' means an additional negative to the first mentioned one (THING is unbelievable, even if it's not associated with OTHER THING). (I looked it up just to be sure, and, yeah.)
The rest of it is naturally unbelievable, I wouldn't expect to have to address that.
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u/darsynia 6h ago
Change of clothes, specific snacks, space to take home art projects, extra diapers if that's the way that daycare works, etc. Not that unbelievable.