I saw some more, from episode 165 to 193 Chi-tan is in every other episode including the 2 part Blue Knight episodes. Another one has Astro shrunk to fight tiny robots and Chi-tan puts him in his mouth.

Astro: No Chi-tan, don't eat me.
What's he look like? Like a baby version of Astro, except he has a center hair spike, like Astro did in the micro-Astro episode of the 2003-04 series. He cries a lot, like babies do, except when he cries, it's loud enough to break things. One time he was watching tv and got scared of a gun-fighter and started to cry. The tv broke into pieces and he started to eat them.

Astro, Uran, and Cobolt had to open his chest to remove the parts.

A gut-buster.