Imagine how different grocery or department stores would be. You walk thru the automatic doors, and see a couple rows of pretty significantly oversized shopping carts (to accomodate adult-sized "tykes" who wish to ride in them.) Even the electric scooters are adapted for littles: they are redesigned to look like carnival-style bumper cars, and even sport racing stripes and numbers.
You head down the produce section, which now features fruits much more prominately than icky veggies. You then head for the meat section, which has fewer facings of beef and pork. In their place would be a ginormous facing of Lunchables and hot dogs.
Once you head for the actual aisles, the changes continue. There's an entire aisle just for kid friendly canned pasta, like spagetiios. But good luck finding many canned green beans.
Because the management would be ADULT littles, there would still be an alcoholic beverage section. But instead of nasty beer or whiskey, you find a lot of "hard" sodas and wine coolers.
But the biggest difference would be the workers. Instead of the usual collared shirt and khakis for a dress code, the clerks would sport either patel colored shortalls or overalls, depending on the season. Over this would be an apron, with a laminated nametag (with the workers name written in either crayon or fingerpaint.) There would also be a standard issue binky and clip attached to the apron.
The part time workers would work a six hour shift, with a one hour break for lunch, diaper change, and nap. Full time associates would work a nine hour shift, with 90 minutes for their nap. They wouldn't need additional breaks, since they would presumably be wearing their bathroom, and can keep a sippy cup at their work station. (so no fear of spils screwing up any electronics.)
Customers would always get to choose a sticker or stamp to go on the bottom of their receipt. Shoppers who spend 25 bucks or more get a free box of crayons. 50 or more dollars in a transaction would get them a choice of a free stuffed animal. And all customers are entitled to a hug from their cashier. Additionally, any customer who can prove it is their birthday would get a birthday hat, a free piece of birthday cake from the bakery, and a voucher that says the store will cover the sales tax on their next visit to the store, up to 50 bucks.
Shoplifters would not be arrested, unless they resist apprehension by security. Instead, they would be spanked, and forced to stand with their nose in the "naughty corner" of the security office for several hours. Then their crayon drawn picture would go up on the banned customers board in the security room.