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He can claim that the track which hung his cart was defective, thereby placing him in danger, which ultimately resulted in his injuries.
My suggestion is to speak to an attorney the first of next week about the incident before you file a claim with Home Depot. You want to make sure it is done right and in a way that will hopefully allow you to recover at least his medical expenses from the incident.
The only factor cutting against you is that the injury was partly caused by a non-employee, the 8 year old kid. If a Home Depot employee crashed the cart into him, he'd have an even better case.
Nevertheless, I think it is worth speaking with an attorney and filing a claim once you get your facts and information straight.