They’re not playing with toys yet, but they do sometime touch them repeatedly. Their ears are growing to normal size; soon they will outpace the head size and look huge. I’ve been giving them a little canned food, mixed with formula, off my finger. It’s mostly gone the right way, and occasionally a kitten will lick a little more off my finger. Once they’ve had a little food, they cannot suck a bottle for at least a half hour. I’ve seen this with every litter I’ve weaned: they cannot suck if there is any trace of food in their mouths. I leave the dish there in case they get inspired, but mostly they just step in the dish, if it’s in their path. Going over is too big a step, and going around is just not in their mental toolkit.
I also have left a litter box in their way, just to annoy them.