What is the most breakdown moment with the baby?

I think when Yamato collapsed the most, he was alone. I don't know why he crawled on the ground and was covered in mud. Because I'm a bit of a neat freak, I can't stand a person with dirt on his body. Then I asked him to film him clean, and then he completely ignored me. Then he took his little clay hand to the water pipe to wash his hands, and then his hands were covered with mud.