Assuming your request is genuine and not rhetorical if you live in a decent area the well funded local library has seemingly continuous story reading and kids activities, all completely free (well, free aside from being rich enough to buy a house in that area and pay the related high prop taxes), and when they need to get out and run, the muni parks and rec dept has a fairly staggering variety of classes for minimal to zero fee for residents ranging from formal classes to playground games and toys. Parks and rec has or had a mandate that part of the building code was no house is more than a couple hundred feet (maybe a thousand feet?) from a free muni park, basically every subdivision has a park with kids actively in it, however minimal the park may be.
At the very low age you specify the selection is somewhat limited and usually they demand a parent participate with the kid WRT bathroom issues etc. When the kids get older there is more fun to be had, (semi-)organized sports and minecraft night at the library and movie night at the park (they use a projector and screen) and after school clubs and stuff.
A condo downtown means the kids will have nothing to do, but the burbs are a lot of fun as a kid and also as a side effect of the cost of entry, they're also relatively safe.