I bought baby food that was out of date what should i do?

Yesterday i went to tescos to get my daughter some food in i bought her some trays of Heinz mums own recipes, so i put it in the microwave when i got home and we sat down to dinner when i was feeding her it i thought this doesnt look right and i looked at the packet and it was best before 30th April i called the store and they asked me to take it up tonight with the receipt.