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In my understanding, WIC checks and EBT cards are not on a set schedule, so if there are spikes of baby food sales at the end of the month and mid-month, these sales are not necessarily linked to WIC. It should be noted that Wal-mart, along with other food chains, keep meticulous records of WIC purchases. If they want to separate WIC from non-WIC purchases in their analyses they should have no problem doing so.