Legal Question in Personal Injury in North Carolina

It never hurts to consult an attorney. That said, cart claims are the worst. I'll do my best to explain it you you - I think it is a very simple concept but every client I have ever explained it to just sits there glaze eyed, slack jawed and dumbfounded. Which in my mind, completely explains how they put their kid in a defective cart but anywho - here goes. They have a duty to do a reasonable inspections of their carts to make sure they are safe and free from defects. Emphasis on 'reasonable'. So do you as a parent when you use a cart. If you the parent, presumably the one person who has the most interest in making sure the cart is safe, did not see anything wrong - how is it to be reasonably expected that the store or cart manufacturer would notice the defect during their inspection so as to be held liable for negligence?