My son loves “peekaboo kidz” (Dr Binocs). It’s viable but be always present to explain the biases to the kids. Numberblocks it’s doable too. I think the best part of numberblocks it’s show number as Pythagoras imagined, like blocks of something, making it visual. Besides those, always watch alongside kids. Thomas the Train, old generation (until 2019 if I’m not wrong), is doable too, but again, always watch and judge each episode accordingly.