A 10-year-old boy was able to buy a Halloween pumpkin carving kit that included a sharp metal blade.
Natalie Greaves, 34, from Sheffield, said she 'went berserk' when her son Shay returned home from Tesco with the £1 kit.
She told her local paper: "I couldn't believe that he could pick that sort of thing up as a child - there should have been an age restriction on it.
"If the tool can cut through a pumpkin I'm sure it could cut through skin. Shay bought it with the intention of doing a pumpkin but if he had fallen over with it in his hand or pocket he could have injured himself.
"I was also concerned that if he'd not shown it to me he might have naively taken it into school and then what would have been the outcome? It could have landed him in trouble."
However, when she contacted the Tesco store she was told by customer service staff that the cashier had not done anything wrong because the kit Shay bought stated children required adult supervision to use it but not to buy it.
The store has now changed its sales policy and now put an age restriction on all its products which include pumpkin carving knives.
A Tesco spokesman said: "We follow a strict Think 25 policy. We were concerned by this incident and acted immediately to ensure all pumpkin carving knives will trigger an age restriction till prompt."
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How to carve a pumpkin (safely!)