There are many activities that will improve the short-term memory process.
I have already mentioned "Mr. Rogers' Neighborhood". As being excellent for a number of reasons For this show I would let the child in the closet, with the TV, but not until heās three years old and then for no more than 1/2 an hour a day. I would ban all shows with cartoons.
Almost any children's game is beneficial for developing short term memory. Later on chess is outstanding for this purpose.
Theater group play acting is another excellent source of short term memory practice.
Equally important are activities like learning to recite poems, starting with nursery rhymes and continuing, much later on, of course, with things like the Declaration of Independence, and world class poetry.