In addiction to it, he was diagnosed “Speech Delay” when he had a health checkup two months ago. I really worried about him. I wasn't able to see other children, and my son was my first child. So, I couldn’t judged why he has a speech delay, because he was just growing up slowly a little, or because he has the less communication with others, or he has some disabilities. But I felt it was most likely the reason why the less communication because he smiles a lot and speaks space languages a lot.
And, I decided to go back in Japan temporarily because facilities for kids and parks have already reopened in Japan. I didn't want him to leave from his father, but I didn't have a choice.
After two weeks quarantine at home, we go to kids spaces everyday. I take him there all day without the time he takes a nap.　Then, his ability of understanding words is growing up rapidly now, and he was able to speak “this” and “that” in Japanese. Today, he was able to speak “Bus” and “Ga-” that means garbage truck. soa natural?

In addictionaddition to itthat [not sure what this is referring back to?], he was diagnosed with “Speech Delay” when he had a health checkup two months ago.

So, I couldn’t judgedjudge why he has a speech delay, - whether it was because he was just growing up slowly a little slowly, or because he has the less communication with others, or because he has some disabilitiesdisability.

But I felt it“less communication” was most likely the reason, why the less communication because he smiles a lot and speaks space languages a lot. [I don’t know what “space languages” is supposed to mean]

And, I decided to go back into Japan temporarily because facilities for kids and parks have already reopened in Japan.

I didn't want him to leavebe apart from his father, but I didn't have a choice.

After two weeks’ quarantine at home, we go to kids’ spaces[playgrounds?] everyday.

I take him there all day withoutexcept thefor timewhen he takes a nap. [I’m not sure this is what you meant, but it’s my best guess]

　Then,His his ability ofto understandingunderstand words is growing up rapidly now, and he wasis able to speaksay “this” and “that” in Japanese.

Today, he was able to speaksay “Bus” and “Ga-”-”, thatwhich means “garbage truck..”