When I worked at Toys R Us, we had a kids clothes section and it was basically on a 3 week rotation. One week, brands 1 and 2 were on sale, next week brands 3 and 4, then finally brands 5 and 6 before starting over the next week. It wasn’t 100% predictable, but generally everything would go on sale at least once a month. Sales on toys were less predictable just because there’s so many more of them to cycle through.